A297916 Number of n X n 0..1 arrays with every element equal to 1, 2, 3 or 4 king-move adjacent elements, with upper left element zero.

0, 4, 109, 4771, 575754, 173216147, 127727388127, 234129105357081, 1063459512165657876

Offset

1,2

Comments

Diagonal of A297923.

Links

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

Example

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

Crossrefs

Cf. A297923.

Sequence in context: A114876 A037980 A240626 * A298541 A015100 A061454

Adjacent sequences: A297913 A297914 A297915 * A297917 A297918 A297919

Keyword

nonn

Author

R. H. Hardin, Jan 08 2018

Status

approved