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 A250967 Number of (n+1) X (2+1) 0..1 arrays with no 2 X 2 subblock having the sum of its diagonal elements less than the absolute difference of its antidiagonal elements. 1
 49, 308, 1945, 12281, 77537, 489543, 3090834, 19514643, 123209858, 777911692, 4911511266, 31009873218, 195787443967, 1236145757310, 7804669708967, 49276445682891, 311117342524943, 1964305653103961, 12402062409962968 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 8*a(n-1) - 13*a(n-2) + 17*a(n-3) - 14*a(n-4) + 3*a(n-5). Empirical g.f.: x*(49 - 84*x + 118*x^2 - 108*x^3 + 24*x^4) / ((1 - x)*(1 - 7*x + 6*x^2 - 11*x^3 + 3*x^4)). - Colin Barker, Nov 24 2018 EXAMPLE Some solutions for n=4: 1 1 0 0 1 0 1 0 1 1 1 0 1 0 1 1 1 1 1 1 1 1 0 1 1 0 0 1 1 1 1 1 1 1 0 1 0 0 1 0 0 0 0 1 1 0 1 1 1 0 1 1 1 1 0 1 1 0 1 0 1 1 1 0 1 0 1 1 0 0 1 0 1 1 0 0 1 1 0 1 0 1 1 1 1 0 1 1 0 0 1 0 1 1 1 0 0 1 0 1 1 0 0 0 0 CROSSREFS Column 2 of A250973. Sequence in context: A239607 A227079 A251222 * A245033 A340124 A017474 Adjacent sequences: A250964 A250965 A250966 * A250968 A250969 A250970 KEYWORD nonn AUTHOR R. H. Hardin, Nov 29 2014 STATUS approved

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Last modified October 3 14:07 EDT 2023. Contains 365866 sequences. (Running on oeis4.)