A302272 Number of n X n 0..1 arrays with every element equal to 1, 2 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

0, 3, 22, 89, 1219, 15862, 384916, 11370253, 325745362, 20953111994

Offset

1,2

Comments

Diagonal of A302278.

Links

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

Example

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

Crossrefs

Cf. A302278.

Sequence in context: A275290 A368478 A277228 * A302723 A095663 A254332

Adjacent sequences: A302269 A302270 A302271 * A302273 A302274 A302275

Keyword

nonn

Author

R. H. Hardin, Apr 04 2018

Status

approved