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A267968
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a(n) = Product_{k = 1..n} k^(k + 1).
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1
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1, 1, 8, 648, 663552, 10368000000, 2902376448000000, 16731622649806848000000, 2245680377810414777401344000000, 7830203310981140781182893575634944000000, 783020331098114078118289357563494400000000000000000, 2457453226667794121573260254679367673480373862400000000000000000
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OFFSET
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0,3
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LINKS
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FORMULA
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MAPLE
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a:= proc(n) a(n):= `if`(n=0, 1, a(n-1)*n^(n+1)) end:
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MATHEMATICA
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a[n_]:= Product[k^(k+1), {k, n}]; Table[a[n], {n, 0, 20}]
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PROG
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(PARI) a(n) = prod(k=1, n, k^(k+1)); \\ Michel Marcus, Jan 23 2016
(SageMath) [product(k^(k+1) for k in range(1, n+1)) for n in range(21)] # G. C. Greubel, Feb 18 2024
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CROSSREFS
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Cf. A002109 (Product_{k = 1..n} k^k), A203421 (Product_{k = 1..n} k^(k-1), up to sign).
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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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