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A165457
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a(n) = (2*n+1)!*(2*n+3)/3.
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3
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1, 10, 280, 15120, 1330560, 172972800, 31135104000, 7410154752000, 2252687044608000, 851515702861824000, 391697223316439040000, 215433472824041472000000, 139600890389978873856000000
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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) = 2*n*(2*n+3)*a(n-1).
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MAPLE
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seq(factorial(2*n+1)*(2*n+3)/3, n=0..12); # Muniru A Asiru, Oct 21 2018
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MATHEMATICA
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Table[(2*n + 1)!*(2*n + 3)/3, {n, 0, 30}] (* G. C. Greubel, Oct 20 2018 *)
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PROG
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(PARI) a(n)=(2*n+1)!*(2*n+3)/3
(Magma) [Factorial(2*n+1)*(2*n+3)/3: n in [0..30]]; // G. C. Greubel, Oct 20 2018
(GAP) List([0..12], n->Factorial(2*n+1)*(2*n+3)/3); # Muniru A Asiru, Oct 21 2018
(Python)
import math
for n in range(0, 12): print(int(math.factorial(2*n+1)*(2*n+3)/3), end=', ') # Stefano Spezia, Oct 21 2018
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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