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A202800 Number of nX6 binary arrays with every one adjacent to another one horizontally or vertically 1
21, 1632, 83518, 4217066, 217145076, 11168045764, 573985849362, 29502860015392, 1516477156642474, 77948189988273490, 4006599407114049916, 205942439718841896456, 10585607796890601624858, 544108792600210068202950 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A202802

LINKS

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

FORMULA

Empirical: a(n) = 50*a(n-1) -185*a(n-2) +12651*a(n-3) +6423*a(n-4) +1075408*a(n-5) +3259685*a(n-6) +21586628*a(n-7) +76542794*a(n-8) -2812955781*a(n-9) -9282864749*a(n-10) +76466631235*a(n-11) +267889215760*a(n-12) -1134901643747*a(n-13) -4335336001609*a(n-14) +10870807935088*a(n-15) +46906211644574*a(n-16) -69760341260668*a(n-17) -364808849169564*a(n-18) +285890091915548*a(n-19) +2095267330255204*a(n-20) -582913492790936*a(n-21) -8842390435967576*a(n-22) -589993582990688*a(n-23) +25633677190161424*a(n-24) +6313554877821056*a(n-25) -35770558600735552*a(n-26) -82722026192384*a(n-27) -46013612995587072*a(n-28) -82921963670853632*a(n-29) +185344286677962752*a(n-30) -36821534264311808*a(n-31) +193374756561289216*a(n-32) +778031675832008704*a(n-33) -391301125804916736*a(n-34) +2056655992384389120*a(n-35) -1044699927222943744*a(n-36) +2643514994808848384*a(n-37) -1117027627006164992*a(n-38) +2008203304609251328*a(n-39) -663346463232753664*a(n-40) +962288728338857984*a(n-41) -230985402763182080*a(n-42) +273382571130224640*a(n-43) -34339947158700032*a(n-44) +36028797018963968*a(n-45)

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A258305 A081786 A295414 * A203361 A192843 A130039

Adjacent sequences:  A202797 A202798 A202799 * A202801 A202802 A202803

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 24 2011

STATUS

approved

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Last modified December 15 11:43 EST 2019. Contains 329999 sequences. (Running on oeis4.)