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 A196191 #7 Mar 30 2012 18:37:29 %S A196191 1,1,1,1,1,2,1,3,2,3,4,4,4,6,7,7,8,10,11,12,14,17,18,20,22,26,30,31, %T A196191 37,39,46,49,54,61,69,74,82,91,100,114,119,136,149,159,176,193,214, %U A196191 227,255,276,303,324,360,394,420,462,496,548,590,638,692,749,812,874,946,1035,1115,1191,1292,1395,1503 %N A196191 G.f. satisfies A(x) = 1/Product_{n>=1} (1 - x^n/A(x^n)). %C A196191 The rate of growth of this sequence is surprisingly slow. %H A196191 Paul D. Hanna, <a href="/A196191/b196191.txt">Table of n, a(n) for n = 0..512</a> %e A196191 G.f.: A(x) = 1 + x + x^2 + x^3 + x^4 + 2*x^5 + x^6 + 3*x^7 + 2*x^8 +... %e A196191 where %e A196191 A(x) = 1/((1 - x/A(x)) * (1 - x^2/A(x^2)) * (1 - x^3/A(x^3)) *...). %o A196191 (PARI) {a(n)=local(A=1+x); for(i=1, n, A=1/prod(k=1, n, (1-x^k/subst(A, x, x^k+x*O(x^n))))); polcoeff(A, n)} %Y A196191 Cf. A050383, A196192. %K A196191 nonn %O A196191 0,6 %A A196191 _Paul D. Hanna_, Sep 28 2011