A284215 Number of n X n 0..1 arrays with the number of 1's horizontally or antidiagonally adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.

1, 6, 70, 6511, 2417194, 3945536189, 26772321109067, 749608559151363940, 85781667864838421304454, 39910247433142071128719168435, 75224282551539452957156354090109083

Offset

1,2

Comments

Diagonal of A284222.

Links

R. H. Hardin, Table of n, a(n) for n = 1..12

Example

Some solutions for n=4
..0..1..0..1. .0..1..1..0. .0..1..1..0. .0..1..1..0. .0..1..1..1
..0..1..1..1. .1..0..1..1. .0..1..0..1. .0..1..1..1. .0..0..1..0
..0..1..1..1. .1..0..0..0. .1..0..1..0. .0..1..1..0. .0..1..0..1
..0..0..1..1. .0..1..1..0. .0..1..1..0. .0..1..0..0. .1..1..1..0

Crossrefs

Cf. A284222.

Sequence in context: A365057 A182563 A211036 * A050788 A241883 A297746

Adjacent sequences: A284212 A284213 A284214 * A284216 A284217 A284218

Keyword

nonn

Author

R. H. Hardin, Mar 23 2017

Status

approved