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A202799 Number of nX5 binary arrays with every one adjacent to another one horizontally or vertically 1
12, 454, 11988, 311144, 8222576, 217145076, 5730640104, 151245101550, 3991784606164, 105354316048660, 2780593210008194, 73387575404296206, 1936901875857360748, 51120219046394982056, 1349204535780755578282 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A202802

LINKS

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

FORMULA

Empirical: a(n) = 27*a(n-1) -82*a(n-2) +1720*a(n-3) -876*a(n-4) +36142*a(n-5) +36267*a(n-6) +228084*a(n-7) +1329202*a(n-8) -3356034*a(n-9) -15601554*a(n-10) +6682402*a(n-11) +62222338*a(n-12) +8454105*a(n-13) -144765880*a(n-14) -62367040*a(n-15) +251331688*a(n-16) +212121408*a(n-17) -212078096*a(n-18) -315914880*a(n-19) -123060608*a(n-20) -12403456*a(n-21) +277981952*a(n-22) +391540736*a(n-23) +190742528*a(n-24) +156106752*a(n-25) +22544384*a(n-26) +16777216*a(n-27)

EXAMPLE

Some solutions for n=3

..1..1..1..0..0....0..0..1..1..1....1..1..1..1..1....1..1..0..0..1

..0..0..0..0..1....0..1..1..1..0....0..1..0..1..1....1..0..1..0..1

..1..1..1..1..1....0..0..1..1..1....1..1..1..0..1....1..1..1..0..0

CROSSREFS

Sequence in context: A092704 A322556 A295413 * A121348 A239365 A277262

Adjacent sequences:  A202796 A202797 A202798 * A202800 A202801 A202802

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 24 2011

STATUS

approved

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Last modified November 20 18:21 EST 2019. Contains 329337 sequences. (Running on oeis4.)