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 A306760 a(n) = Product_{i=1..n, j=1..n} (i*j + 1). 9
 2, 90, 705600, 4105057320000, 52487876090562232320000, 3487017405172854771910634342400000000, 2448893405298238642974553493547144534294528000000000000, 33257039167768610289435138215602132823918399655132218973388800000000000000000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS FORMULA a(n) ~ c * n^(n*(2*n+1) + 2*gamma) * (2*Pi)^n * exp(1/6 + log(n)^2 - 2*n^2), where c = 1/A306765 and gamma is the Euler-Mascheroni constant A001620. MATHEMATICA Table[Product[i*j + 1, {i, 1, n}, {j, 1, n}], {n, 1, 10}] Table[n!^(2*n) * Product[Binomial[n + 1/j, n], {j, 1, n}], {n, 1, 10}] CROSSREFS Cf. A079478, A101686, A185141, A324444, A306765, A324589, A306907. Sequence in context: A157064 A058527 A342329 * A306964 A138583 A193747 Adjacent sequences:  A306757 A306758 A306759 * A306761 A306762 A306763 KEYWORD nonn AUTHOR Vaclav Kotesovec, Mar 08 2019 STATUS approved

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Last modified May 26 17:16 EDT 2022. Contains 354092 sequences. (Running on oeis4.)