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 A009422 #15 Jun 23 2015 21:41:56
%S A009422 0,0,2,-6,30,-160,1084,-8316,74456,-749184,8474240,-106035424,
%T A009422 1459781056,-21914009728,356711937152,-6258266154752,117778607150592,
%U A009422 -2366994133647360,50601711980789760,-1146653711692951552
%N A009422 Expansion of log(1+x)*log(1+tan(x)).
%F A009422 a(n) ~ (n-1)! * (-1)^n * (4/Pi)^n * log(4/(4-Pi)). - _Vaclav Kotesovec_, Jan 23 2015
%t A009422 Log[ 1+x ]*Log[ 1+Tan[ x ] ]
%t A009422 CoefficientList[Series[Log[1 + x]*Log[1 + Tan[x]], {x, 0, 20}], x] * Range[0, 20]! (* _Vaclav Kotesovec_, Jan 23 2015 *)
%K A009422 sign,easy
%O A009422 0,3
%A A009422 _R. H. Hardin_
%E A009422 Extended with signs by _Olivier Gérard_, Mar 15 1997