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A021734
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G.f.: 1/((1-x)(1-3x)(1-11x)(1-12x)).
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0
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1, 27, 502, 8022, 118363, 1663809, 22644784, 301210524, 3938740405, 50831269671, 649205557546, 8222000492706, 103410878533327, 1293146143620813, 16092125344053988, 199423591976817768
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n)=(80*12^(n+3) - 9*11^(n+4) + 55*3^(n+3) - 36)/7920. [Yahia Kahloune, Jun 27 2013]
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MATHEMATICA
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CoefficientList[Series[1/((1-x)(1-3x)(1-11x)(1-12x)), {x, 0, 20}], x] (* Harvey P. Dale, Mar 19 2011 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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