A317740 Number of nX7 0..1 arrays with every element unequal to 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

0, 22, 6, 35, 74, 36, 274, 280, 1065, 1939, 5947, 13101, 35847, 83062, 222994, 537669, 1395855, 3480819, 8943072, 22421261, 57460156, 144954058, 369414113, 936279738, 2382817938, 6046949393, 15383924113, 39073108671, 99355550907, 252459496924

Offset

1,2

Comments

Column 7 of A317741.

Links

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

R. H. Hardin, Empirical recurrence of order 97

Formula

Empirical recurrence of order 97 (see link above)

Example

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

Crossrefs

Cf. A317741.

Sequence in context: A304456 A040469 A040468 * A317901 A040467 A194708

Adjacent sequences: A317737 A317738 A317739 * A317741 A317742 A317743

Keyword

nonn

Author

R. H. Hardin, Aug 05 2018

Status

approved