The On-Line Encyclopedia of Integer Sequences (OEIS)

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A199223

Number of nX1 0..2 arrays with values 0..2 introduced in row major order, the number of instances of each value within one of each other, and every element equal to zero or one horizontal or vertical neighbors
(history; published version)

#5 by Russ Cox at Sat Mar 31 12:36:35 EDT 2012

AUTHOR

_R. H. Hardin (rhhardin(AT)att.net) _ Nov 04 2011

Discussion

Sat Mar 31

12:36

OEIS Server: https://oeis.org/edit/global/875

#4 by Ron Hardin at Fri Nov 04 05:05:35 EDT 2011

STATUS

editing

approved

#3 by Ron Hardin at Fri Nov 04 05:05:14 EDT 2011

LINKS

R. H. Hardin, <a href="/A199223/b199223.txt">Table of n, a(n) for n = 1..175</a>

#2 by Ron Hardin at Fri Nov 04 05:04:33 EDT 2011

NAME

allocated for Ron HardinNumber of nX1 0..2 arrays with values 0..2 introduced in row major order, the number of instances of each value within one of each other, and every element equal to zero or one horizontal or vertical neighbors

DATA

1, 1, 1, 6, 15, 15, 90, 226, 219, 1436, 3671, 3514, 24039, 62130, 58962, 415608, 1082718, 1021368, 7354732, 19274263, 18101068, 132456534, 348731568, 326374830, 2418406938, 6390767156, 5964605638, 44643259798, 118329627186, 110190867844

OFFSET

1,4

COMMENTS

Column 1 of A199230

EXAMPLE

Some solutions for n=6

..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0

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

..2....2....0....1....0....1....1....2....1....0....2....1....1....2....2

..1....0....1....2....2....2....2....0....1....2....2....2....0....1....2

..2....1....2....2....1....0....2....2....2....2....0....1....2....0....1

..0....2....2....1....2....2....0....1....2....1....1....2....2....2....0

KEYWORD

allocated

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net) Nov 04 2011

STATUS

approved

editing

#1 by Ron Hardin at Fri Nov 04 05:02:15 EDT 2011

NAME

allocated for Ron Hardin

KEYWORD

allocated

STATUS

approved