A297987 Number of n X n 0..1 arrays with every element equal to 1, 2, 3 or 6 king-move adjacent elements, with upper left element zero.

0, 4, 48, 466, 5100, 74675, 1276012, 30240388, 1056360518, 50037661325, 3406737828874, 353272517327686, 52791942245108114

Offset

1,2

Comments

Diagonal of A297993.

Links

Table of n, a(n) for n=1..13.

Example

Some solutions for n=6
..0..0..1..0..0..0. .0..1..1..1..1..0. .0..1..0..0..1..0. .0..1..1..1..1..1
..1..1..0..1..1..0. .0..0..0..0..0..1. .0..1..0..1..0..1. .0..0..0..0..0..1
..0..1..0..1..0..1. .1..1..1..0..1..1. .0..1..0..1..1..1. .1..1..1..1..1..0
..0..0..0..1..0..0. .0..0..0..0..0..1. .0..1..0..1..0..1. .1..0..0..0..0..1
..0..1..0..1..1..0. .1..1..1..1..1..0. .0..1..0..1..0..1. .1..0..1..1..0..1
..0..1..1..0..0..1. .0..0..0..0..0..0. .1..1..0..1..1..0. .1..1..0..1..0..1

Crossrefs

Cf. A297993.

Sequence in context: A059409 A357663 A297816 * A298842 A298649 A299603

Adjacent sequences: A297984 A297985 A297986 * A297988 A297989 A297990

Keyword

nonn

Author

R. H. Hardin, Jan 10 2018

Status

approved