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A289644 Number of n X n 0..1 arrays with the number of 1's horizontally, antidiagonally or vertically adjacent to some 0 two less than the number of 0's adjacent to some 1. 0
0, 2, 61, 8554, 2662095, 5675111511, 35072966294346, 1096128160677176696, 121691314711314375091217 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A289651.

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A289651.

Sequence in context: A065589 A190681 A181005 * A094478 A273090 A064738

Adjacent sequences:  A289641 A289642 A289643 * A289645 A289646 A289647

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 09 2017

STATUS

approved

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Last modified October 26 11:29 EDT 2020. Contains 338027 sequences. (Running on oeis4.)