A300367 Number of nX3 0..1 arrays with every element equal to 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
0, 1, 0, 3, 3, 8, 16, 32, 70, 135, 293, 585, 1221, 2496, 5156, 10609, 21818, 44955, 92476, 190459, 391929, 806935, 1660946, 3419147, 7038323, 14488296, 29824518, 61393333, 126379174, 260151058, 535522942, 1102374986, 2269243610, 4671246404
Offset: 1
Keywords
Examples
All solutions for n=5 ..0..0..0. .0..0..1. .0..0..1 ..0..1..0. .0..1..1. .0..1..1 ..1..1..0. .0..0..0. .1..0..0 ..0..0..1. .1..1..0. .1..0..1 ..0..1..1. .1..0..0. .1..1..1
Links
- R. H. Hardin, Table of n, a(n) for n = 1..210
Crossrefs
Cf. A300372.
Formula
Empirical: a(n) = a(n-2) +2*a(n-3) +5*a(n-4) +6*a(n-5) +4*a(n-6) +6*a(n-7) +a(n-8) -a(n-12) +2*a(n-13) -a(n-14)
Comments