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A208701 Number of 6Xn 0..1 arrays avoiding 0 0 1 and 1 0 0 horizontally and 0 1 0 and 1 0 1 vertically 1
26, 676, 3910, 23637, 177872, 1415508, 12014735, 104356568, 923279444, 8235619511, 73879113940, 664653206922, 5990740209831, 54051817052290, 488001087186844, 4407494366626123, 39816464814539414, 359742927867575360 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 6 of A208698

LINKS

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

FORMULA

Empirical: a(n) = 26*a(n-1) -158*a(n-2) -1382*a(n-3) +18622*a(n-4) -2726*a(n-5) -773954*a(n-6) +2137776*a(n-7) +17201826*a(n-8) -83055266*a(n-9) -217296903*a(n-10) +1760160521*a(n-11) +1171071355*a(n-12) -24780285339*a(n-13) +10005245573*a(n-14) +249321424957*a(n-15) -285920221762*a(n-16) -1854743954652*a(n-17) +3297359901882*a(n-18) +10332502131910*a(n-19) -25182395378470*a(n-20) -42778930531840*a(n-21) +141488386034569*a(n-22) +125899728052985*a(n-23) -609949885665960*a(n-24) -220597358566925*a(n-25) +2059525006253211*a(n-26) -40011194809805*a(n-27) -5502762220042382*a(n-28) +1753141379940508*a(n-29) +11675701447985698*a(n-30) -6709795768433848*a(n-31) -19631096393236878*a(n-32) +16050719566638984*a(n-33) +25926067903712304*a(n-34) -28009638881000348*a(n-35) -26374004885117740*a(n-36) +37387829958914720*a(n-37) +19794293292796032*a(n-38) -38877116675526288*a(n-39) -9720211994065776*a(n-40) +31685587137209232*a(n-41) +1472677053516768*a(n-42) -20227150770914624*a(n-43) +2248731781438336*a(n-44) +10054887495122048*a(n-45) -2427920722772608*a(n-46) -3849012313372032*a(n-47) +1379769696658240*a(n-48) +1113946173483520*a(n-49) -531029766245248*a(n-50) -236316361665024*a(n-51) +146191374190336*a(n-52) +34656267521024*a(n-53) -29043125238272*a(n-54) -3030552760320*a(n-55) +4109630337024*a(n-56) +60238921728*a(n-57) -401151369216*a(n-58) +19085361152*a(n-59) +25476169728*a(n-60) -2312765440*a(n-61) -940310528*a(n-62) +112721920*a(n-63) +15204352*a(n-64) -2097152*a(n-65) for n>66

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A208553 A262271 A207921 * A207470 A207522 A207257

Adjacent sequences:  A208698 A208699 A208700 * A208702 A208703 A208704

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 01 2012

STATUS

approved

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Last modified November 27 12:51 EST 2021. Contains 349394 sequences. (Running on oeis4.)