A301540 Number of nX7 0..1 arrays with every element equal to 0, 1 or 3 horizontally or vertically adjacent elements, with upper left element zero.

21, 86, 374, 1841, 9037, 47791, 255406, 1432328, 8145489, 46701775, 269741883, 1568279203, 9153838956, 53577605791, 314145731065, 1844204380914, 10835966335712, 63710021424647, 374740321237045, 2204822119962792

Offset

1,1

Comments

Column 7 of A301541.

Links

R. H. Hardin, Table of n, a(n) for n = 1..156

Example

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

Crossrefs

Cf. A301541.

Sequence in context: A220613 A045016 A171129 * A240518 A219850 A158540

Adjacent sequences: A301537 A301538 A301539 * A301541 A301542 A301543

Keyword

nonn

Author

R. H. Hardin, Mar 23 2018

Status

approved