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A269136 Number of nXn 0..3 arrays with some element plus some horizontally, antidiagonally or vertically adjacent neighbor totalling three no more than once. 0
4, 148, 18556, 8317996, 14197016484, 95884587957284, 2621894498331024092, 294433751149574057834796, 137064853562490916405823252564, 266206369700280385363973380215109284 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A269143.

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=3

..2..2..3. .0..0..2. .2..1..1. .2..3..2. .0..0..1. .3..1..3. .0..1..3

..3..2..3. .0..2..2. .0..0..1. .3..2..2. .1..1..3. .3..1..3. .3..1..3

..3..2..2. .0..0..1. .1..1..1. .3..2..2. .0..2..2. .3..2..3. .1..3..1

CROSSREFS

Cf. A269143.

Sequence in context: A246961 A180375 A160470 * A226073 A294826 A247115

Adjacent sequences:  A269133 A269134 A269135 * A269137 A269138 A269139

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 20 2016

STATUS

approved

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Last modified February 22 06:03 EST 2019. Contains 320385 sequences. (Running on oeis4.)