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 A130651 #13 Mar 01 2015 14:51:49 %S A130651 0,0,0,0,1,17,180,1536,11616,81552,545536,3532544,22368000,139434240, %T A130651 859634688,5258379264,31986270208,193796182016,1170829049856, %U A130651 7059331547136 %N A130651 1/16 the number of permutations of 0..n having exactly 3 maxima. %F A130651 Conjecture: a(n) = 2^(n-8)*(3^(n+1) - 2^(n+2)*n + 2*n^2 - 3). - _Vaclav Kotesovec_, Nov 29 2012 %F A130651 Empirical g.f.: -x^4*(3*x-1) / ((2*x-1)^3*(4*x-1)^2*(6*x-1)). - _Colin Barker_, Dec 06 2014 %F A130651 Empirical: a(n) = A000487(n+1)/16. - _R. J. Mathar_, Mar 01 2015 %Y A130651 Cf. A100575. %K A130651 nonn %O A130651 0,6 %A A130651 _R. H. Hardin_, Aug 11 2007