A317772 Number of nX7 0..1 arrays with every element unequal to 0, 1 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

21, 30, 44, 32, 42, 54, 75, 107, 149, 221, 317, 491, 739, 1157, 1774, 2819, 4306, 6792, 10478, 16717, 25903, 41123, 63905, 101339, 158206, 252088, 395573, 629930, 993422, 1586551, 2503753, 3994117, 6322941, 10097970, 15999961, 25564515, 40566306

Offset

1,1

Comments

Column 7 of A317773.

Links

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

Example

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

Crossrefs

Cf. A317773.

Sequence in context: A225653 A363609 A336357 * A308339 A186455 A318081

Adjacent sequences: A317769 A317770 A317771 * A317773 A317774 A317775

Keyword

nonn

Author

R. H. Hardin, Aug 06 2018

Status

approved