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%I #19 Apr 13 2018 04:27:14
%S 1,1,2,2,6,24,48,720,720,1440,241920,120960,3628800,14515200,87091200,
%T 958003200,261273600,2615348736000,804722688000,125536739328000,
%U 2414168064000,753220435968000,256094948229120000,22596613079040000,102181884343418880000
%N 1/1, 2*3/lcm(2,3), 4*5*6/lcm(4,5,6), 7*8*9*10/lcm(7,8,9,10), ...
%F a(n) = (Product_{j=n*(n-1)/2+1..n*(n+1)/2} j) / lcm(n*(n-1)/2+1, n*(n-1)/2+2, ..., n*(n+1)/2). - _Jon E. Schoenfield_, Mar 17 2018
%F a(n) = A057003(n)/A061431(n). - _Michel Marcus_, Apr 12 2018
%e a(5) = 6 = (11*12*13*14*15)/lcm(11,12,13,14,15) = 360360/60060.
%p a:=n->product(j,j=n*(n-1)/2+1..n*(n+1)/2)/lcm(seq(j,j=n*(n-1)/2+1..n*(n+1)/2)): seq(a(n),n=1..27); # _Emeric Deutsch_, Aug 07 2005
%Y Cf. A000217, A057003, A061431.
%K nonn
%O 1,3
%A _Amarnath Murthy_, Apr 03 2004
%E More terms from _Emeric Deutsch_, Aug 07 2005
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