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 A025923 Expansion of 1/((1-x^9)*(1-x^10)*(1-x^11)). 0
 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 2, 1, 1, 0, 0, 0, 0, 1, 1, 2, 2, 2, 1, 1, 0, 0, 1, 1, 2, 2, 3, 2, 2, 1, 1, 1, 1, 2, 2, 3, 3, 3, 2, 2, 2, 2, 2, 2, 3, 3, 4, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,21 LINKS Table of n, a(n) for n=0..79. Index entries for linear recurrences with constant coefficients, signature (0,0,0,0,0,0,0,0,1,1,1,0,0,0,0,0,0,0,-1,-1,-1,0,0,0,0,0,0,0,0,1). FORMULA a(n) = a(n-9) + a(n-10) + a(n-11) - a(n-19) - a(n-20) - a(n-21) + a(n-30). - R. J. Mathar, Jul 19 2014 MATHEMATICA CoefficientList[1/Series[Times@@(1-x^Range[9, 11]), {x, 0, 120}], x] (* or *) LinearRecurrence[{0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 1}, {1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 2, 1, 1, 0, 0, 0, 0, 1, 1, 2}, 120] (* Harvey P. Dale, Apr 01 2018 *) PROG (PARI) Vec(1/((1-x^9)*(1-x^10)*(1-x^11)) + O(x^90)) \\ Jinyuan Wang, Feb 28 2020 CROSSREFS Sequence in context: A127326 A321923 A064663 * A351358 A138158 A057276 Adjacent sequences: A025920 A025921 A025922 * A025924 A025925 A025926 KEYWORD nonn AUTHOR N. J. A. Sloane STATUS approved

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Last modified November 29 20:40 EST 2023. Contains 367447 sequences. (Running on oeis4.)