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A316458 Expansion of 60*x*(1 + 4*x + x^2) / (1 - x)^5. 4
60, 540, 2160, 6000, 13500, 26460, 47040, 77760, 121500, 181500, 261360, 365040, 496860, 661500, 864000, 1109760, 1404540, 1754460, 2166000, 2646000, 3201660, 3840540, 4570560, 5400000, 6337500, 7392060, 8573040, 9890160, 11353500, 12973500, 14760960 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Seems to be the negative of the second column of A316349.
LINKS
FORMULA
G.f.: 60*x*(1 + 4*x + x^2) / (1 - x)^5.
a(n) = 60 * A000537(n).
a(n) = 15*n^4 + 30*n^3 + 15*n^2.
a(n) = 5*a(n-1) - 10*a(n-2) + 10*a(n-3) - 5*a(n-4) + a(n-5) for n>5.
PROG
(PARI) Vec(60*x*(1 + 4*x + x^2) / (1 - x)^5 + O(x^40))
(PARI) a(n) = 15*n^4 + 30*n^3 + 15*n^2
CROSSREFS
Sequence in context: A069140 A229376 A298684 * A184191 A101384 A229750
KEYWORD
nonn,easy
AUTHOR
Colin Barker, Aug 12 2018
STATUS
approved

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Last modified July 24 14:22 EDT 2024. Contains 374584 sequences. (Running on oeis4.)