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 A062030 Group even numbers into (2,4), (6,8,10,12), (14,16,18,20,22,24), ...; a(n) = product of n-th group. 5
 8, 5760, 42577920, 1300252262400, 111644006842368000, 21695920874860629196800, 8291067715225260172247040000, 5644260808699395278689265516544000, 6360332664265371581768550654463180800000, 11209384544297234954537967755979151481241600000, 29531169256166572959626706182319305835700813824000000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Harry J. Smith, Table of n, a(n) for n=1..100 FORMULA a(n) = 4^n * Gamma(1 + n + n^2)/Gamma(1 - n + n^2). - G. C. Greubel, May 06 2022 EXAMPLE a(3) = 14*16*18*20*22*24 = 42577920. MATHEMATICA Table[4^n*Gamma[1+n+n^2]/Gamma[1-n+n^2], {n, 30}] (* G. C. Greubel, May 05 2022 *) PROG (PARI) { for(n=1, 100, write("b062030.txt", n, " ", 2^(2*n)*(n^2+n)!/(n^2-n)!) ) } \\ Harry J. Smith, Jul 30 2009 (SageMath) [4^n*gamma(1+n+n^2)/gamma(1-n+n^2) for n in (1..30)] # G. C. Greubel, May 05 2022 CROSSREFS Cf. A062029, A062031, A062032. Sequence in context: A093937 A318897 A178329 * A052497 A304426 A316281 Adjacent sequences: A062027 A062028 A062029 * A062031 A062032 A062033 KEYWORD nonn AUTHOR Amarnath Murthy, Jun 02 2001 EXTENSIONS More terms from Jason Earls, Jun 10 2001 Typo in a(4) corrected by N. J. A. Sloane, Aug 31 2009 using the b-file. STATUS approved

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Last modified February 2 06:48 EST 2023. Contains 360000 sequences. (Running on oeis4.)