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

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