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 A136593 #2 Mar 30 2012 18:37:09 %S A136593 1,6,-25,-135,1834,-3668,-110692,1339020,-1181664,-164709864, %T A136593 2206092096,395662176,-463716547776,7029335571840,8900411569920, %U A136593 -2265668505227520,38689597829053440,92447263589921280,-17785648201625856000,338957966532455424000 %N A136593 Column 3 of triangle A136590. %F A136593 E.g.f.: A(x) = log(1 + x + x^2)^3 / 3!. %e A136593 E.g.f.: A(x) = 1*x^3/3! + 6*x^4/4! - 25*x^5/5! - 135*x^6/6! + 1834*x^7/7! -... %o A136593 (PARI) a(n)=(n+3)!*polcoeff(log(1+x+x^2 +x*O(x^(n+3)))^3/3!,n+3) %Y A136593 Cf. A136590, A136591, A136592, A136594. %K A136593 sign %O A136593 3,2 %A A136593 _Paul D. Hanna_, Jan 10 2008