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 A337282 Partial sums of A337281. 4
 0, 0, 2, 5, 13, 33, 75, 166, 358, 754, 1564, 3203, 6491, 13043, 26021, 51596, 101772, 199828, 390790, 761537, 1479337, 2865589, 5536719, 10673010, 20530866, 39417766, 75545728, 144551167, 276172727, 526908583, 1003986313, 1910718488, 3632257048, 6897610216, 13085528650, 24801630845, 46966595909, 88866759433 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 REFERENCES R. Schumacher, Explicit formulas for sums involving the squares of the first n Tribonacci numbers, Fib. Q., 58:3 (2020), 194-202. LINKS Index entries for linear recurrences with constant coefficients, signature (3,-1,-1,-3,1,1,1). FORMULA From Colin Barker, Sep 13 2020: (Start) G.f.: x^2*(2 - x + x^3) / ((1 - x)*(1 - x - x^2 - x^3)^2). a(n) = 3*a(n-1) - a(n-2) - a(n-3) - 3*a(n-4) + a(n-5) + a(n-6) + a(n-7) for n>6. (End) CROSSREFS Cf. A000073, A337281. Sequence in context: A219230 A108890 A220739 * A027929 A001659 A088921 Adjacent sequences:  A337279 A337280 A337281 * A337283 A337284 A337285 KEYWORD nonn AUTHOR N. J. A. Sloane, Sep 12 2020 STATUS approved

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Last modified August 18 02:34 EDT 2022. Contains 356204 sequences. (Running on oeis4.)