This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A110347 #4 Dec 05 2013 19:57:01 %S A110347 1,3,24,180,2520,30240,604800,9979200,259459200,5448643200, %T A110347 174356582400,4446092851200,168951528345600,5068545850368000, %U A110347 223016017416192000,7694052600858624000,384702630042931200000,15003402571674316800000 %N A110347 a(n) = meantorial(n) = the product of the set of n closest numbers with an arithmetic mean of n. %C A110347 a(n) ==0 (mod n), except for n=2. %F A110347 a(2n+1) = (n+1)(n+2)...(2n+1)(2n+2) ...(3n+1)(3n+2). a(2n) = n(n+1)(n+2)...(2n-2)(2n-1)(2n+1)(2n+2)...(3n-1)(3n). %e A110347 a(3) = 2*3*4 = 24, a(6)= 3*4*5*7*8*9 = 30240. %Y A110347 Cf. A110348. %K A110347 easy,nonn %O A110347 1,2 %A A110347 _Amarnath Murthy_, Jul 21 2005 %E A110347 More terms from _Joshua Zucker_, May 08 2006