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 A228503 Number of nX5 binary arrays with top left value 1 and no two ones adjacent horizontally, vertically, diagonally or antidiagonally. 1
 5, 11, 88, 358, 2002, 9528, 49101, 243118, 1228036, 6141239, 30865981, 154742849, 776765183, 3896668986, 19553995645, 98108834263, 492283814664, 2470048647138, 12393793010466, 62186850336292, 312029099308093, 1565635002686314 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 5 of A228506 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 2*a(n-1) +16*a(n-2) +a(n-3) -27*a(n-4) +a(n-5) +4*a(n-6). Empirical: g.f. -x*(5+x-14*x^2+x^3+2*x^4) / ( -1+2*x+16*x^2+x^3-27*x^4+x^5+4*x^6 ). - R. J. Mathar, Aug 25 2013 EXAMPLE Some solutions for n=4 ..1..0..0..0..0....1..0..0..0..0....1..0..0..0..0....1..0..0..0..1 ..0..0..0..1..0....0..0..1..0..1....0..0..0..0..0....0..0..0..0..0 ..0..0..0..0..0....1..0..0..0..0....0..1..0..0..1....1..0..0..0..0 ..0..0..0..0..1....0..0..0..1..0....0..0..0..0..0....0..0..0..0..0 CROSSREFS Sequence in context: A090518 A057726 A057727 * A128454 A368013 A188514 Adjacent sequences: A228500 A228501 A228502 * A228504 A228505 A228506 KEYWORD nonn AUTHOR R. H. Hardin Aug 23 2013 STATUS approved

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Last modified June 25 08:42 EDT 2024. Contains 373701 sequences. (Running on oeis4.)