A297312 Number of nX6 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 or 2 neighboring 1s.

21, 654, 13937, 340825, 8273245, 200646607, 4869858862, 118156684121, 2867120332406, 69570025944705, 1688108287602302, 40961748924233513, 993931518658886393, 24117625902266425892, 585211158099440381626

Offset: 1

Author

R. H. Hardin, Dec 28 2017

Keywords

• nonn

Comments

Column 6 of A297314.

Examples

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

Links

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

Crossrefs

Cf. A297314.

Formula

Empirical: a(n) = 9*a(n-1) +324*a(n-2) +1428*a(n-3) -6254*a(n-4) -30323*a(n-5) +97813*a(n-6) +136166*a(n-7) -925019*a(n-8) +1597152*a(n-9) -1178936*a(n-10) +88497*a(n-11) +390484*a(n-12) -218599*a(n-13) +44101*a(n-14) -18308*a(n-15) -28030*a(n-16) +15541*a(n-17) +1362*a(n-18) -1947*a(n-19) +200*a(n-20) +84*a(n-21) -16*a(n-22) for n>25