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 A180488 #17 Apr 15 2024 06:49:56 %S A180488 0,1,3,9,23,60,152,388,984,2501,6347,16117,40911,103864,263664,669352, %T A180488 1699216,4313673,10950739,27799745,70572839,179157364,454811656, %U A180488 1154592108,2931065640,7440849549,18889457819,47953075565 %N A180488 Partial sums of A006864. %H A180488 <a href="/index/Rec#order_05">Index entries for linear recurrences with constant coefficients</a>, signature (3,0,-4,3,-1). %F A180488 a(n) = +3*a(n-1) -4*a(n-3) +3*a(n-4) -a(n-5). G.f.: x^2 / ( (x-1)*(x^4-2*x^3+2*x^2+2*x-1) ). [_R. J. Mathar_, Sep 19 2010] %Y A180488 Cf. A006864. %K A180488 nonn,easy %O A180488 1,3 %A A180488 _Jonathan Vos Post_, Sep 07 2010 %E A180488 Edited (changed definition, deleted incorrect terms) by _N. J. A. Sloane_, Sep 09 2010