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 A179870 a(n) = ((n-1)! * (n+1)!) ^ 2. 0
 4, 36, 2304, 518400, 298598400, 365783040000, 842764124160000, 3344930808791040000, 21407557176262656000000, 209815467884550291456000000, 3021342737537524196966400000000, 61783437639904832303765913600000000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..12. FORMULA a(n) = A175430(n) ^ 2 = ((Product_(k=1,2,...,n) k*A020725(k)) / n) ^ 2 = ((Product_(k=1,2,...,n) k*(k+1)) / n) ^ 2. MATHEMATICA Table[((n-1)!(n+1)!)^2, {n, 15}] (* Harvey P. Dale, Jul 12 2020 *) PROG (PARI) a(n)=(n-1)!^4*(n^4+2*n^3+n^2) \\ Charles R Greathouse IV, Jan 03 2013 CROSSREFS Sequence in context: A086857 A174864 A175493 * A001152 A349848 A218515 Adjacent sequences: A179867 A179868 A179869 * A179871 A179872 A179873 KEYWORD nonn,easy AUTHOR Jaroslav Krizek, Jul 30 2010 STATUS approved

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Last modified December 7 01:11 EST 2023. Contains 367616 sequences. (Running on oeis4.)