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 A272244 a(n) = Product_{k=0..n} (n^2 + k^2). 5
 0, 2, 160, 21060, 4352000, 1313845000, 547573478400, 301758856490000, 212663770808320000, 186659516597629140000, 199722414913149440000000, 255947740845844788169000000, 387074162712817024892928000000, 682170272459193898736228210000000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Table of n, a(n) for n=0..13. FORMULA a(n) ~ 2^(n + 1/2) * n^(2*(n+1)) / exp((4-Pi)*n/2). MATHEMATICA Table[Product[n^2+k^2, {k, 0, n}], {n, 0, 15}] CROSSREFS Cf. A101686, A272180, A272246, A272247, A272248, A323540. Sequence in context: A326488 A170992 A179958 * A178575 A069580 A332218 Adjacent sequences: A272241 A272242 A272243 * A272245 A272246 A272247 KEYWORD nonn,easy AUTHOR Vaclav Kotesovec, Apr 23 2016 STATUS approved

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Last modified October 4 16:17 EDT 2023. Contains 365887 sequences. (Running on oeis4.)