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 A245866 Number of length n+2 0..5 arrays with some pair in every consecutive three terms totalling exactly 5. 1
 90, 318, 960, 3102, 9726, 30900, 97602, 309078, 977664, 3094038, 9789654, 30977796, 98020170, 310161870, 981426624, 3105480558, 9826505742, 31093507092, 98387556594, 311322635814, 985101990912, 3117106968486, 9863299264806 (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) = 2*a(n-1) + 4*a(n-2) - a(n-3). Empirical g.f.: 6*x*(15 + 23*x - 6*x^2) / (1 - 2*x - 4*x^2 + x^3). - Colin Barker, Nov 04 2018 EXAMPLE Some solutions for n=7: 1 5 0 3 5 3 2 3 0 4 3 4 1 0 1 3 5 4 3 1 2 0 2 4 1 0 2 1 4 2 0 0 0 1 2 4 3 2 3 1 4 5 0 5 2 3 5 5 2 0 3 5 3 5 4 5 0 0 3 0 1 1 0 0 3 4 2 0 2 0 1 0 1 5 2 4 3 2 1 2 2 5 3 5 1 5 4 0 4 3 4 1 2 3 4 5 0 0 4 0 4 4 4 5 1 2 1 4 4 0 3 0 5 4 1 3 1 0 1 2 0 0 4 1 3 5 1 4 2 5 2 2 3 1 5 3 4 3 5 3 1 5 2 1 CROSSREFS Column 5 of A245869. Sequence in context: A250878 A027621 A331259 * A157888 A201103 A234991 Adjacent sequences: A245863 A245864 A245865 * A245867 A245868 A245869 KEYWORD nonn AUTHOR R. H. Hardin, Aug 04 2014 STATUS approved

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Last modified October 4 23:18 EDT 2023. Contains 365888 sequences. (Running on oeis4.)