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 A082735 #7 Aug 07 2015 03:06:30 %S A082735 1,8,105,5760,328185,42577920,5568833025,1300252262400, %T A082735 304513870485825,111644006842368000,40992233865440682825, %U A082735 21695920874860629196800,11492457771692770753505625,8291067715225260172247040000 %N A082735 Product of n-th group of terms in A074147. %F A082735 a(1) = 1, a(2n) = product of next 2n even numbers. a(2n+1) = product of next 2n+1 odd numbers. %F A082735 a(n)=A006882[A074148(n)]/A006882[A074148(n-2)]. a(2n-1)=A062031(n). a(2n)=A062030(n). # _R. J. Mathar_, Jul 17 2007 %p A082735 A074148 := proc(n) (2*n^2+4*n+(-1)^n-1)/4 ; end: A082735 := proc(n) doublefactorial(A074148(n))/doublefactorial(A074148(n-2)) ; end: seq(A082735(n),n=1..20) ; # _R. J. Mathar_, Jul 17 2007 %Y A082735 Cf. A074147, A074148, A074149, A082736. %K A082735 nonn %O A082735 1,2 %A A082735 _Amarnath Murthy_, Apr 14 2003 %E A082735 Corrected and extended by _R. J. Mathar_, Jul 17 2007