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A092352
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G.f.: (1+3*x^3)/((1-x)^2*(1-x^3)^2).
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0
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1, 2, 3, 9, 15, 21, 36, 51, 66, 94, 122, 150, 195, 240, 285, 351, 417, 483, 574, 665, 756, 876, 996, 1116, 1269, 1422, 1575, 1765, 1955, 2145, 2376, 2607, 2838, 3114, 3390, 3666, 3991, 4316, 4641, 5019, 5397, 5775, 6210, 6645, 7080, 7576, 8072, 8568, 9129, 9690
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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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MATHEMATICA
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CoefficientList[Series[(1+3x^3)/((1-x)^2(1-x^3)^2), {x, 0, 80}], x] (* or *) LinearRecurrence[ {2, -1, 2, -4, 2, -1, 2, -1}, {1, 2, 3, 9, 15, 21, 36, 51}, 80] (* Harvey P. Dale, May 27 2022 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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