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A202904 Number of n X 6 0..1 arrays with every one equal to some NW, E or S neighbor. 1

%I #9 Jul 19 2023 12:42:14

%S 1,344,16062,538672,19675348,734614472,27173404568,1004314801728,

%T 37150257828816,1374167316241760,50826441572407904,

%U 1879942732569197184,69534653388866844992,2571919585157154125440,95129106434387390980480

%N Number of n X 6 0..1 arrays with every one equal to some NW, E or S neighbor.

%H R. H. Hardin, <a href="/A202904/b202904.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 64*a(n-1) -1428*a(n-2) +23104*a(n-3) -359812*a(n-4) +4291328*a(n-5) -41248448*a(n-6) +374113600*a(n-7) -2765377536*a(n-8) +16066440192*a(n-9) -85494580224*a(n-10) +388914239488*a(n-11) -1383466633216*a(n-12) +4562035998720*a(n-13) -14299390476288*a(n-14) +37484061147136*a(n-15) -113414227689472*a(n-16) +433921159331840*a(n-17) -1553250990424064*a(n-18) +5441033254993920*a(n-19) -17912970109779968*a(n-20) +49554669076217856*a(n-21) -116701869358710784*a(n-22) +242127262453858304*a(n-23) -438801431827316736*a(n-24) +692536817349558272*a(n-25) -963631848901050368*a(n-26) +1180232308288913408*a(n-27) -1255235273860579328*a(n-28) +1152998968636997632*a(n-29) -911239313994285056*a(n-30) +609512621590183936*a(n-31) -338901163359338496*a(n-32) +155199364795465728*a(n-33) -55989331109609472*a(n-34) +13458022323978240*a(n-35) -1424967069597696*a(n-36) for n>37.

%e Some solutions for n=3

%e ..1..1..0..1..1..0....1..1..0..0..1..0....1..1..1..1..1..0....0..1..1..0..1..1

%e ..1..1..1..1..1..1....1..1..0..1..1..1....0..1..0..1..1..0....1..0..1..1..0..1

%e ..0..0..0..0..0..1....0..1..0..0..1..1....0..1..1..0..1..0....1..1..1..1..1..0

%Y Column 6 of A202906.

%K nonn

%O 1,2

%A _R. H. Hardin_, Dec 25 2011

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Last modified April 24 18:17 EDT 2024. Contains 371962 sequences. (Running on oeis4.)