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 A207836 #12 Jun 13 2015 00:54:10 %S A207836 0,3,16,75,336,1463,6240,26199,108640,445995,1815792,7341347,29505840, %T A207836 117982815,469672384,1862393775,7359403968,28991540051,113892526800, %U A207836 446305331451,1744950085648,6808253393415,26513475730464,103072540115975,400058834841120 %N A207836 a(n) = n*A052530(n)/2. %H A207836 Colin Barker, <a href="/A207836/b207836.txt">Table of n, a(n) for n = 2..1000</a> %H A207836 F. Goebel, A. A. Jagers, <a href="http://dx.doi.org/10.1016/0095-8956(79)90010-8">On a conjecture of Tutte concerning minimal tree numbers</a>, J. Combin. Theory Ser. B 26 (1979), no. 3, 346-348. MR0535948 (80m:05064). %H A207836 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (8,-18,8,-1). %F A207836 a(n) = 8*a(n-1)-18*a(n-2)+8*a(n-3)-a(n-4) for n>5. - _Colin Barker_, Jun 08 2015 %F A207836 G.f.: x^3*(x^2-8*x+3) / (x^2-4*x+1)^2. - _Colin Barker_, Jun 08 2015 %o A207836 (PARI) concat(0, Vec(x^3*(x^2-8*x+3)/(x^2-4*x+1)^2 + O(x^100))) \\ _Colin Barker_, Jun 08 2015 %Y A207836 Cf. A052530. %K A207836 nonn,easy %O A207836 2,2 %A A207836 _N. J. A. Sloane_, Feb 21 2012