A268749 Number of nX7 binary arrays with some element plus some horizontally or vertically adjacent neighbor totalling two no more than once.

72, 1760, 44067, 1016807, 22577073, 487682438, 10319681062, 215027310572, 4425392044505, 90177748184504, 1822495416470859, 36579128848735042, 729860195814419706, 14489046573912834959, 286363070886993749567

Offset: 1

Author

R. H. Hardin, Feb 12 2016

Keywords

• nonn

Comments

Column 7 of A268750.

Examples

			Some solutions for n=3
..0..0..1..0..1..0..0. .0..1..1..0..1..0..0. .0..0..0..0..0..1..0
..1..0..0..1..0..1..0. .0..0..0..0..0..0..1. .0..1..0..1..0..1..0
..0..0..1..0..0..1..0. .0..0..0..1..0..0..0. .0..0..0..0..0..0..0
		

Links

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

Crossrefs

Cf. A268750.

Formula

Empirical: a(n) = 18*a(n-1) +325*a(n-2) -4074*a(n-3) -48747*a(n-4) +201072*a(n-5) +2225020*a(n-6) -6248320*a(n-7) -47573325*a(n-8) [phone]*a(n-9) [phone]*a(n-10) -1794441336*a(n-11) -2517416282*a(n-12) [phone]*a(n-13) [phone]*a(n-14) -55187301646*a(n-15) [phone]*a(n-16) [phone]*a(n-17) -158181613013*a(n-18) -96178246900*a(n-19) [phone]*a(n-20) -18739881048*a(n-21) -224653932202*a(n-22) [phone]*a(n-23) [phone]*a(n-24) -69076575582*a(n-25) -27720217521*a(n-26) [phone]*a(n-27) [phone]*a(n-28) -6197138172*a(n-29) -207452034*a(n-30) [phone]*a(n-31) -10034133*a(n-32) -81777708*a(n-33) +1520627*a(n-34) +4630616*a(n-35) -28132*a(n-36) -153828*a(n-37) -2195*a(n-38) +2658*a(n-39) +93*a(n-40) -18*a(n-41) -a(n-42)