A303807 Number of nX7 0..1 arrays with every element unequal to 0, 1, 3 or 4 king-move adjacent elements, with upper left element zero.

21, 127, 83, 202, 291, 597, 1217, 2767, 6147, 14940, 34846, 84947, 210191, 538910, 1368999, 3502960, 8990885, 23400795, 61220178, 160733766, 422311782, 1114702509, 2954914697, 7862464520, 20960436098, 55991586940, 149902307803

Offset

1,1

Comments

Column 7 of A303808.

Links

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

Example

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

Crossrefs

Cf. A303808.

Sequence in context: A053052 A243882 A002299 * A304854 A305251 A316551

Adjacent sequences: A303804 A303805 A303806 * A303808 A303809 A303810

Keyword

nonn

Author

R. H. Hardin, Apr 30 2018

Status

approved