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
Keywords
Examples
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
Links
- R. H. Hardin, Table of n, a(n) for n = 1..210
Crossrefs
Cf. A301790.
Formula
Empirical: a(n) = 2*a(n-1) -a(n-3) for n>7.
Comments