A318546 Number of n X n 0..1 arrays with every element unequal to 1, 2, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

0, 3, 5, 64, 842, 14760, 437825, 21556643, 1516492860, 183780175203

Offset

1,2

Comments

Diagonal of A318552.

Links

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

Example

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

Crossrefs

Cf. A318552.

Sequence in context: A222644 A181904 A319584 * A076513 A222611 A261071

Adjacent sequences: A318543 A318544 A318545 * A318547 A318548 A318549

Keyword

nonn,more

Author

R. H. Hardin, Aug 28 2018

Status

approved