A303308 Number of n X n 0..1 arrays with every element equal to 0, 1, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
1, 3, 12, 36, 139, 1221, 26184, 746323, 23967605, 1285074158, 140135122490, 23444843868325, 5152091496332058, 1785689257359207106, 1097023324108868377427, 1066418515771155179484946
Offset: 1
Keywords
Examples
Some solutions for n=5 ..0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0. .0..0..1..0..1 ..0..1..0..1..0. .0..1..0..0..0. .0..1..0..0..0. .1..1..1..0..1 ..0..1..1..1..0. .0..1..0..1..0. .0..1..0..1..0. .1..0..1..0..1 ..0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0. .1..0..1..0..1 ..0..1..0..1..0. .0..0..0..1..0. .0..1..0..1..0. .1..0..1..0..1
Links
- R. H. Hardin, Table of n, a(n) for n = 1..17
Crossrefs
Cf. A303314.
Comments