A326159 - OEIS

A326159

Number of n X n 0..1 arrays with every element unequal to 0, 1, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

1, 3, 9, 85, 1136, 39808, 3984553, 1000921717, 666253766253, 1113066644514662

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OFFSET

1,2

COMMENTS

Diagonal of A326165.

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=5:

0 1 1 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0

0 0 1 1 1 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0

0 1 1 1 1 1 0 1 0 1 1 0 1 1 0 1 0 1 0 1

0 0 1 0 1 1 0 1 1 0 0 0 1 0 0 1 1 1 0 0

0 0 0 0 0 0 0 0 1 0 0 1 0 1 0 1 1 0 1 1

CROSSREFS

Cf. A326165.

Sequence in context: A274032 A032078 A307799 * A203559 A184098 A249789

Adjacent sequences: A326156 A326157 A326158 * A326160 A326161 A326162

KEYWORD

nonn,more

AUTHOR

R. H. Hardin, Jun 09 2019

STATUS

approved