A320396 Number of n X n 0..1 arrays with every element unequal to 0, 1, 2, 3 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

1, 8, 142, 5956, 561290, 127789964, 69104597430, 87904609418608, 265822679694670068, 1902510531491092792194

Offset

1,2

Comments

Diagonal of A320402.

Links

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

Example

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

Crossrefs

Cf. A320402.

Sequence in context: A180357 A373874 A317112 * A112464 A227875 A235383

Adjacent sequences: A320393 A320394 A320395 * A320397 A320398 A320399

Keyword

nonn,more

Author

R. H. Hardin, Oct 12 2018

Status

approved