The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A318074 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A318074

Number of nX7 0..1 arrays with every element unequal to 0, 1, 2 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
(history; published version)

#4 by R. H. Hardin at Wed Aug 15 13:20:16 EDT 2018

STATUS

editing

approved

#3 by R. H. Hardin at Wed Aug 15 13:20:13 EDT 2018

LINKS

R. H. Hardin, <a href="/A318074/b318074.txt">Table of n, a(n) for n = 1..210</a>

#2 by R. H. Hardin at Wed Aug 15 13:20:00 EDT 2018

NAME

allocated for R. H. Hardin

Number of nX7 0..1 arrays with every element unequal to 0, 1, 2 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

DATA

64, 190, 404, 861, 2195, 9966, 46884, 184156, 819263, 3703730, 15865269, 69944965, 310937380, 1361781447, 5998215467, 26503896368, 116659469704, 513984726015, 2266966511804, 9989194862172, 44021107304800, 194059543279029

OFFSET

1,1

COMMENTS

Column 7 of A318075.

EXAMPLE

Some solutions for n=5

..0..1..1..1..1..1..1. .0..0..1..1..1..1..1. .0..0..0..0..0..0..0

..1..1..1..1..1..1..1. .0..1..1..1..1..1..1. .0..1..1..0..0..0..0

..1..1..1..1..1..0..1. .1..1..0..1..1..0..1. .0..0..0..0..1..0..0

..1..0..0..1..0..1..1. .1..0..1..1..1..0..1. .0..0..0..1..0..0..0

..1..1..1..1..1..1..0. .1..1..1..1..1..1..1. .0..0..0..0..0..0..1

CROSSREFS

Cf. A318075.

KEYWORD

allocated

nonn

AUTHOR

R. H. Hardin, Aug 15 2018

STATUS

approved

editing

#1 by R. H. Hardin at Wed Aug 15 13:15:52 EDT 2018

NAME

allocated for R. H. Hardin

KEYWORD

allocated

STATUS

approved