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 A055925 #5 Mar 30 2012 18:37:42 %S A055925 -1,1,0,-2,0,1,6,0,-6,1,-24,0,35,-10,-2,120,0,-225,85,30,-9,-720,0, %T A055925 1624,-735,-350,189,-9,5040,0,-13132,6769,3920,-2898,252,50,-40320,0, %U A055925 118124,-67284,-44898,40824,-4914,-1800,267,362880,0,-1172700,723680 %N A055925 Exponential reciprocal of A055924. %F A055925 E.g.f.: exp(1-(1+x)^y). %e A055925 -1; 1,0; -2,0,1; 6,0,-6,1; -24,0,35,-10,-2; ... %Y A055925 Main diagonal gives A000587. %K A055925 sign,tabl %O A055925 1,4 %A A055925 _Wouter Meeussen_, _Christian G. Bower_, Jul 06 2000