A297944 Number of n X n 0..1 arrays with every element equal to 1, 2, 3 or 5 king-move adjacent elements, with upper left element zero.

0, 4, 56, 948, 23840, 938557, 53630550, 4667940027, 616122541550

Offset

1,2

Comments

Diagonal of A297951.

Links

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

Example

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

Crossrefs

Cf. A297951.

Sequence in context: A378802 A222687 A111874 * A298555 A240298 A298383

Adjacent sequences: A297941 A297942 A297943 * A297945 A297946 A297947

Keyword

nonn

Author

R. H. Hardin, Jan 09 2018

Status

approved