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 A054121 T(n,n-3), array T as in A054120. 0
 1, 9, 39, 114, 261, 507, 879, 1404, 2109, 3021, 4167, 5574, 7269, 9279, 11631, 14352, 17469, 21009, 24999, 29466, 34437, 39939, 45999, 52644, 59901, 67797, 76359, 85614, 95589, 106311, 117807, 130104, 143229, 157209 (list; graph; refs; listen; history; text; internal format)
 OFFSET 3,2 LINKS Index entries for linear recurrences with constant coefficients, signature (4,-6,4,-1) FORMULA For n>3, a(n) = 3/2 * (3n^3-30n^2+107n-134). MATHEMATICA LinearRecurrence[{4, -6, 4, -1}, {1, 9, 39, 114, 261}, 40] (* Harvey P. Dale, Sep 28 2017 *) CROSSREFS Sequence in context: A226449 A299280 A023163 * A139594 A034263 A060929 Adjacent sequences:  A054118 A054119 A054120 * A054122 A054123 A054124 KEYWORD nonn AUTHOR STATUS approved

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Last modified December 6 09:37 EST 2019. Contains 329800 sequences. (Running on oeis4.)