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A180754 Half the number of nX5 binary arrays with each element equal to at least two neighbors 1
0, 3, 3, 21, 86, 410, 1874, 8840, 41755, 197883, 936625, 4434387, 20996674, 99434998, 470911050, 2230166446, 10561720749, 50018822099, 236882697591, 1121846953883, 5312927519916, 25161362888858, 119161085234850, 564332106834338 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 5 of A180760

LINKS

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

FORMULA

Empirical: a(n) = 9*a(n-1) - 26*a(n-2) + 24*a(n-3) + 47*a(n-4) - 157*a(n-5) - 43*a(n-6) + 641*a(n-7) - 643*a(n-8) - 952*a(n-9) + 3460*a(n-10) - 2021*a(n-11) - 2111*a(n-12) + 2715*a(n-13) - 1249*a(n-14) - 4657*a(n-15) - 1514*a(n-16) + 1961*a(n-17) - 1230*a(n-18) + 6713*a(n-19) + 8832*a(n-20) + 10212*a(n-21) + 1971*a(n-22) - 6552*a(n-23) - 2819*a(n-24) - 2898*a(n-25) - 973*a(n-26) + 302*a(n-27) + 433*a(n-28) + 286*a(n-29)

CROSSREFS

Sequence in context: A130723 A209528 A214778 * A224091 A224751 A303228

Adjacent sequences: A180751 A180752 A180753 * A180755 A180756 A180757

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 20 2010

STATUS

approved

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Last modified December 6 19:09 EST 2022. Contains 358645 sequences. (Running on oeis4.)