A301796 Number of 7 X n 0..1 arrays with every element equal to 0 or 1 horizontally or antidiagonally adjacent elements, with upper left element zero.

64, 610, 192, 221, 275, 364, 508, 741, 1118, 1728, 2715, 4312, 6896, 11077, 17842, 28788, 46499, 75156, 121524, 196549, 317942, 514360, 832171, 1346400, 2178440, 3524709, 5703018, 9227596, 14930483, 24157948, 39088300, 63246117, 102334286

Offset

1,1

Comments

Row 7 of A301790.

Links

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

Formula

Empirical: a(n) = 2*a(n-1) -a(n-3) for n>7.

Example

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

Crossrefs

Cf. A301790.

Sequence in context: A209780 A330831 A177757 * A301969 A208642 A301890

Adjacent sequences: A301793 A301794 A301795 * A301797 A301798 A301799

Keyword

nonn

Author

R. H. Hardin, Mar 26 2018

Status

approved