A302166 Number of 4Xn 0..1 arrays with every element equal to 0, 1 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
8, 10, 17, 29, 51, 109, 206, 407, 791, 1584, 3104, 6165, 12131, 24059, 47443, 93958, 185498, 367087, 725156, 1434386, 2834565, 5605574, 11079494, 21907412, 43304842, 85620318, 169257166, 334632998, 661534245, 1307869617, 2585565413, 5111662053
Offset: 1
Keywords
Examples
Some solutions for n=5 ..0..1..1..0..0. .0..0..1..1..0. .0..1..0..1..0. .0..1..0..1..0 ..0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0. .1..1..0..1..1 ..0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0 ..0..1..0..0..1. .0..1..0..0..1. .0..1..0..0..1. .0..1..0..1..0
Links
- R. H. Hardin, Table of n, a(n) for n = 1..210
Crossrefs
Cf. A302163.
Formula
Empirical: a(n) = a(n-1) +a(n-2) +8*a(n-4) -4*a(n-5) -4*a(n-6) -a(n-7) -22*a(n-8) +a(n-9) +5*a(n-10) +2*a(n-11) +28*a(n-12) +6*a(n-13) -3*a(n-14) -3*a(n-15) -17*a(n-16) -4*a(n-17) +2*a(n-18) +2*a(n-19) +4*a(n-20) -a(n-22) for n>23
Comments