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A180764 Half the number of nX4 binary arrays with each element equal to at least one neighbor 1
2, 34, 390, 4475, 52186, 606546, 7053923, 82032712, 953982820, 11094190209, 129018028226, 1500393683522, 17448578663219, 202915341402216, 2359770191311572, 27442554696574793, 319138622503858354 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A180771

LINKS

R. H. Hardin, Table of n, a(n) for n=1..99

FORMULA

Empirical: a(n) = 9*a(n-1) + 35*a(n-2) - 29*a(n-3) - 256*a(n-4) - 120*a(n-5) + 695*a(n-6) + 579*a(n-7) - 949*a(n-8) - 1076*a(n-9) + 485*a(n-10) + 1488*a(n-11) + 588*a(n-12) - 857*a(n-13) - 368*a(n-14) - 73*a(n-15) - 52*a(n-16) + 26*a(n-17) + 14*a(n-18) + 12*a(n-19) - 4*a(n-20)

CROSSREFS

Sequence in context: A301611 A224294 A092408 * A228654 A005261 A104898

Adjacent sequences:  A180761 A180762 A180763 * A180765 A180766 A180767

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 20 2010

STATUS

approved

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Last modified April 23 03:26 EDT 2019. Contains 322380 sequences. (Running on oeis4.)