A320358 Number of n X n 0..1 arrays with every element unequal to 2, 3, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

0, 1, 4, 97, 7902, 1752652, 1076542482, 1799446075386, 8145782933199794, 100266040940073292719

Offset

1,3

Comments

Diagonal of A320364.

Links

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

Example

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

Crossrefs

Cf. A320364.

Sequence in context: A041275 A024384 A368004 * A180830 A361883 A265721

Adjacent sequences: A320355 A320356 A320357 * A320359 A320360 A320361

Keyword

nonn,more

Author

R. H. Hardin, Oct 11 2018

Status

approved