A284158 - OEIS

A284158

Number of n X n 0..1 arrays with the number of 1's horizontally or vertically adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.

1, 4, 62, 5888, 2179255, 3648835932, 25064817057781, 708804054303474038

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OFFSET

1,2

COMMENTS

Diagonal of A284165.

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A284165.

Sequence in context: A087613 A350282 A369725 * A202630 A102196 A102192

Adjacent sequences: A284155 A284156 A284157 * A284159 A284160 A284161

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 21 2017

STATUS

approved