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A269029 Number of nXn 0..2 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two exactly once. 1
0, 24, 348, 18384, 1326576, 208867428, 63310818360, 40013955378312, 51911512873697772, 140039775591497709312, 791864652110724378938904, 9334169232033820587188999592, 232675011644185023762453520339476 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A269035.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..14

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A269035.

Sequence in context: A056634 A022748 A288968 * A004325 A075621 A293618

Adjacent sequences:  A269026 A269027 A269028 * A269030 A269031 A269032

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 18 2016

STATUS

approved

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Last modified February 22 21:58 EST 2018. Contains 299469 sequences. (Running on oeis4.)