A300426 Number of nX7 0..1 arrays with every element equal to 1, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

8, 981, 37042, 1240541, 41940055, 1429216222, 48707694395, 1658695873019, 56476495490791, 1923047237868526, 65481763889325791, 2229710018276335601, 75923489576925169301, 2585258366904643253068, 88030215196778828100398

Offset

1,1

Comments

Column 7 of A300427.

Links

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

Example

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

Crossrefs

Cf. A300427.

Sequence in context: A231905 A203524 A331491 * A300688 A300611 A301353

Adjacent sequences: A300423 A300424 A300425 * A300427 A300428 A300429

Keyword

nonn

Author

R. H. Hardin, Mar 05 2018

Status

approved