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 A163189 #2 Mar 30 2012 18:37:17 %S A163189 1,1,2,5,14,40,159,812,5133,42942,474619,6708142,121367878,2819170132, %T A163189 83571532538,3148951107867,151069353323782,9219463980803329, %U A163189 714951048370178409,70448496563603216429,8818161368662624534857 %N A163189 G.f.: A(x) = exp( Sum_{n>=1} (1 + A000204(n)*x)^n * x^n/n ). %C A163189 Compare to g.f. of Fibonacci sequence: exp( Sum_{n>=1} A000204(n)*x^n/n ), where A000204 is the Lucas numbers. %e A163189 G.f.: A(x) = 1 + x + 2*x^2 + 5*x^3 + 14*x^4 + 40*x^5 + 159*x^6 +... %o A163189 (PARI) {a(n)=polcoeff(exp(sum(m=1, n+1, (1+(fibonacci(m-1)+fibonacci(m+1))*x+x*O(x^n))^m*x^m/m)), n)} %Y A163189 Cf. A156216, A156100, A159308, A000204. %K A163189 nonn %O A163189 0,3 %A A163189 _Paul D. Hanna_, Jul 22 2009