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 A061706 #3 May 10 2013 12:44:46 %S A061706 0,0,1,3,11,44,185,805,3552,15671,68827,301108,1314553,5735237, %T A061706 25024104,109216135,476775195,2081568940,9088283129,39679791093, %U A061706 173240442512,756351086215,3302134987931,14416689863220,62941426366169 %N A061706 G.f.: x^2*(x-1)^8/(4*x^9+x^8-79*x^7+166*x^6-225*x^5+206*x^4-129*x^3+50*x^2-11*x+1). %D A061706 R. P. Stanley, Enumerative Combinatorics I, 4.7.19. %F A061706 a(n) = 11*a(n - 1) - 50*a(n - 2) + 129*a(n - 3) - 206*a(n - 4) + 225*a(n - 5) - 166*a(n - 6) + 79*a(n - 7) - a(n - 8) - 4*a(n - 9) for n >= 11. %Y A061706 Cf. A001169. %K A061706 nonn %O A061706 0,4 %A A061706 _Vladeta Jovovic_, Jun 18 2001