A317428 Number of nX7 0..1 arrays with every element unequal to 0, 1, 3, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.

21, 237, 311, 1666, 8887, 32359, 135880, 617692, 2534229, 10679366, 46580215, 196401620, 830912246, 3573030794, 15182231394, 64434941953, 275517063290, 1173301166480, 4989227156149, 21285269812669, 90693224894008

Offset

1,1

Comments

Column 7 of A317429.

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

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

Crossrefs

Cf. A317429.

Sequence in context: A304668 A306171 A316426 * A089937 A175843 A198974

Adjacent sequences: A317425 A317426 A317427 * A317429 A317430 A317431

Keyword

nonn

Author

R. H. Hardin, Jul 27 2018

Status

approved