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 A011888 #17 Feb 07 2024 12:34:01 %S A011888 0,1,6,22,61,142,292,548,958,1583,2498,3794,5579,7980,11144,15240, %T A011888 20460,27021,35166,45166,57321,71962,89452,110188,134602,163163, %U A011888 196378,234794,278999,329624,387344,452880 %N A011888 Partial sums of A011863. %H A011888 <a href="/index/Rec#order_07">Index entries for linear recurrences with constant coefficients</a>, signature (5,-9,5,5,-9,5,-1). %F A011888 From _R. J. Mathar_, Mar 24 2011: (Start) %F A011888 a(n) = (2*n+3)*(6*n^4+36*n^3+76*n^2+66*n+5)/960-(-1)^n/64. %F A011888 G.f.: x*(1+x+x^2) / ( (1+x)*(x-1)^6 ). (End) %Y A011888 Cf. A011863. %K A011888 nonn,easy %O A011888 0,3 %A A011888 _R. K. Guy_