A268780 Number of n X 7 binary arrays with some element plus some horizontally, vertically, diagonally or antidiagonally adjacent neighbor totalling two no more than once.

72, 766, 10615, 115391, 1288693, 13493468, 140404442, 1425678976, 14341399141, 142487073304, 1404716302427, 13742060955231, 133640514636584, 1292631496259982, 12446235637750465, 119353876258739189

Offset: 1

Author

R. H. Hardin, Feb 13 2016

Keywords

• nonn

Comments

Column 7 of A268781.

Examples

			Some solutions for n=4
..0..0..0..0..1..0..0. .0..1..0..0..0..0..0. .1..0..1..0..0..1..0
..0..0..0..0..0..0..0. .0..0..0..1..0..1..0. .0..0..0..0..0..0..1
..0..0..0..0..1..0..0. .0..0..0..0..0..0..0. .1..0..0..0..0..0..0
..0..0..0..1..0..0..0. .1..0..0..0..0..0..1. .0..0..0..0..0..0..1
		

Links

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

Crossrefs

Cf. A268781.

Formula

Empirical: a(n) = 12*a(n-1) +64*a(n-2) -942*a(n-3) -1476*a(n-4) +26868*a(n-5) +2249*a(n-6) -376788*a(n-7) +333472*a(n-8) +2686292*a(n-9) -4376424*a(n-10) -8985248*a(n-11) [phone]*a(n-12) [phone]*a(n-13) -55768960*a(n-14) +923990*a(n-15) [phone]*a(n-16) -25850884*a(n-17) -69171189*a(n-18) [phone]*a(n-19) [phone]*a(n-20) -22502076*a(n-21) -9502460*a(n-22) +7752808*a(n-23) +1023260*a(n-24) -1356480*a(n-25) +55136*a(n-26) +94080*a(n-27) -14400*a(n-28).