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A268780 Number of nX7 binary arrays with some element plus some horizontally, vertically, diagonally or antidiagonally adjacent neighbor totalling two no more than once. 1
72, 766, 10615, 115391, 1288693, 13493468, 140404442, 1425678976, 14341399141, 142487073304, 1404716302427, 13742060955231, 133640514636584, 1292631496259982, 12446235637750465, 119353876258739189 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A268781.

LINKS

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

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) +21881197*a(n-12) +12658940*a(n-13) -55768960*a(n-14) +923990*a(n-15) +80699088*a(n-16) -25850884*a(n-17) -69171189*a(n-18) +34934900*a(n-19) +34833816*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)

EXAMPLE

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

CROSSREFS

Cf. A268781.

Sequence in context: A008448 A282213 A304828 * A086579 A113855 A082949

Adjacent sequences:  A268777 A268778 A268779 * A268781 A268782 A268783

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 13 2016

STATUS

approved

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Last modified July 22 07:23 EDT 2019. Contains 325216 sequences. (Running on oeis4.)