A298713 Number of n X n 0..1 arrays with every element equal to 2, 3, 4, 6 or 7 king-move adjacent elements, with upper left element zero.

0, 1, 4, 59, 3508, 563977, 193439202, 177476979652, 405759343397572

Offset

1,3

Comments

Diagonal of A298719.

Links

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

Example

Some solutions for n=5
..0..0..0..0..0. .0..0..1..0..0. .0..0..0..0..0. .0..0..0..0..0
..0..1..1..1..0. .0..1..1..1..0. .0..1..0..1..0. .0..1..1..1..0
..1..1..1..0..0. .0..1..1..1..0. .0..1..1..1..0. .1..0..1..1..1
..0..1..1..1..0. .0..1..0..1..0. .0..1..1..1..0. .0..1..1..1..0
..0..0..0..0..0. .0..0..0..0..0. .0..0..1..0..0. .0..0..0..0..0

Crossrefs

Cf. A298719.

Sequence in context: A331712 A026586 A298064 * A058173 A074835 A060492

Adjacent sequences: A298710 A298711 A298712 * A298714 A298715 A298716

Keyword

nonn

Author

R. H. Hardin, Jan 25 2018

Status

approved