The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A234354 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A234354

Number of non-equivalent (mod D_3) ways to arrange 6 indistinguishable points on a triangular grid of side n so that no three points are collinear.
(history; published version)

#11 by Vaclav Kotesovec at Tue Apr 19 07:48:18 EDT 2016

STATUS

proposed

approved

#10 by Altug Alkan at Tue Apr 19 07:24:00 EDT 2016

STATUS

editing

proposed

#9 by Altug Alkan at Tue Apr 19 07:23:37 EDT 2016

EXTENSIONS

a(14)-a(17) from _Heinrich Ludwig, April _, Apr 19, 2016

STATUS

proposed

editing

#8 by Heinrich Ludwig at Tue Apr 19 04:55:34 EDT 2016

STATUS

editing

proposed

Discussion

Tue Apr 19

05:18

Michel Marcus: Your name and date are not exactly as they should be. You have an example just above.

#7 by Heinrich Ludwig at Tue Apr 19 04:54:03 EDT 2016

DATA

1, 47, 1112, 11743, 82988, 433372, 1820163, 6459496, 20287372, 57129426, 147915285, 356109110, 804785159, 1722171831

EXTENSIONS

a(14)-a(17) from Heinrich Ludwig, April 19, 2016

STATUS

approved

editing

#6 by Ralf Stephan at Fri Jan 03 02:51:16 EST 2014

STATUS

proposed

approved

#5 by Heinrich Ludwig at Tue Dec 31 02:20:15 EST 2013

STATUS

editing

proposed

#4 by Heinrich Ludwig at Tue Dec 31 02:20:08 EST 2013

DATA

1, 47, 1112, 11743, 82988, 433372, 1820163, 6459496, 20287372, 57129426

STATUS

proposed

editing

#3 by Heinrich Ludwig at Mon Dec 30 12:23:45 EST 2013

STATUS

editing

proposed

#2 by Heinrich Ludwig at Mon Dec 30 12:23:38 EST 2013

NAME

allocated for Heinrich LudwigNumber of non-equivalent (mod D_3) ways to arrange 6 indistinguishable points on a triangular grid of side n so that no three points are collinear.

DATA

1, 47, 1112, 11743, 82988, 433372, 1820163, 6459496, 20287372

OFFSET

4,2

COMMENTS

Column 6 of triangle A234350.

Without the restriction "non-equivalent (mod D_3)" the numbers are given by A194134.

EXAMPLE

There is a(4) = 1 non-equivalent way to arrange 6 indistinguishable points (x) on a triangular grid of side 4:

.

x x

x . x

. x x .

CROSSREFS

Cf. A234350, A194134

Arranging 3 points: A234351

Arranging 4 points: A234352

Arranging 5 points: A234353

KEYWORD

allocated

nonn,more

AUTHOR

Heinrich Ludwig, Dec 30 2013

STATUS

approved

editing