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A196507
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a(n) = n*(3*n^2 + 6*n + 1).
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1
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0, 10, 50, 138, 292, 530, 870, 1330, 1928, 2682, 3610, 4730, 6060, 7618, 9422, 11490, 13840, 16490, 19458, 22762, 26420, 30450, 34870, 39698, 44952, 50650, 56810, 63450, 70588, 78242, 86430, 95170, 104480, 114378, 124882
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OFFSET
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0,2
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REFERENCES
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Jolley, Summation of Series, Dover (1961), eq. 45 on page 8.
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LINKS
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FORMULA
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a(n) = 2*5 + 5*8 + 8*11 + ... + (3*k-1)*(3*k+2) + ... (n terms) = n*A100536(n+1).
G.f.: -2*x*(-5 - 5*x + x^2) / (x-1)^4.
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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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