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 A324402 a(n) = Product_{i=1..n, j=1..n} (2*i + j). 2
 3, 360, 6350400, 36212520960000, 117563342374788710400000, 337905477880065368190647009280000000, 1234818479230749311108497004714406224855040000000000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Robert Israel, Table of n, a(n) for n = 1..25 FORMULA a(n) ~ sqrt(A/Pi) * 3^(9*n*(n+1)/4 + 11/24) * n^(n^2 - 11/24) / (2^(n^2 + 3*n/2 + 17/24) * exp(3*n^2/2 + 1/24)), where A is the Glaisher-Kinkelin constant A074962. a(n) = 3*n*a(n-1)*Product_{i=1..n-1} (2*i+n)(2*n+i). - Chai Wah Wu, Feb 26 2019 a(n) = a(n-1) * (3*n)! * (3*n-2)!!/((2*n)! * n!!). - Robert Israel, Feb 27 2019 MAPLE f:= n -> mul((2*i+n)!/(2*i)!, i=1..n): map(f, [\$1..10]); # Robert Israel, Feb 27 2019 MATHEMATICA Table[Product[2*i+j, {i, 1, n}, {j, 1, n}], {n, 1, 10}] CROSSREFS Cf. A059486, A079478, A324403. Sequence in context: A266454 A288948 A297483 * A324427 A304285 A324269 Adjacent sequences:  A324399 A324400 A324401 * A324403 A324404 A324405 KEYWORD nonn AUTHOR Vaclav Kotesovec, Feb 26 2019 STATUS approved

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Last modified September 20 08:08 EDT 2019. Contains 327214 sequences. (Running on oeis4.)