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 A074702 #10 Jun 26 2013 09:10:51
%S A074702 1,4,43,806,23213,947864,51997111,3685295242,327581799289,
%T A074702 35673657942572,4670006130663971,723461783075360174,
%U A074702 130890931830249779173,27346855400248614577216,6534075316966068976316143,1770326031190494313270654994,539845302687736618823239734641
%N A074702 a(n) = ((n+1)^2*(n-1)*a(n-1)+(-1)^(n+1))/n.
%H A074702 Harvey P. Dale, <a href="/A074702/b074702.txt">Table of n, a(n) for n = 1..252</a>
%F A074702 a(n) = round((n+1)!^2*BesselJ(0, 2))/n.
%t A074702 nxt[{n_,a_}]:={n+1,(n*a*(n+2)^2+(-1)^(n+2))/(n+1)}; Transpose[ NestList[ nxt,{1,1},15]][[2]] (* _Harvey P. Dale_, Jun 26 2013 *)
%Y A074702 Cf. A073701.
%K A074702 easy,nonn
%O A074702 1,2
%A A074702 _Vladeta Jovovic_, Sep 03 2002
%E A074702 More terms from _Emeric Deutsch_, Dec 18 2003
%E A074702 More terms from _Harvey P. Dale_, Jun 26 2013