A284106 Number of n X n 0..1 arrays with the number of 1's king-move adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.

1, 4, 25, 5896, 905327, 3514396333, 12336109217951, 635264284970617848, 46214926085757662096414

Offset

1,2

Comments

Diagonal of A284113.

Links

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

Example

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

Crossrefs

Cf. A284113.

Sequence in context: A144229 A316926 A317699 * A063802 A276266 A276268

Adjacent sequences: A284103 A284104 A284105 * A284107 A284108 A284109

Keyword

nonn

Author

R. H. Hardin, Mar 20 2017

Status

approved