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 A087098 #7 Feb 02 2021 21:08:30
%S A087098 0,1,12,15,37,44,77,92,136,167,222,285,351,478,555,810,898,1409,1508,
%T A087098 2531,2641,4688,4809,8904,9036,17227,17370,33753,33907,66674,66839,
%U A087098 132374,132550,263621,263808,525951,526149,1050436,1050645,2099220
%N A087098 Partial sums of A087100.
%H A087098 <a href="/index/Rec#order_07">Index entries for linear recurrences with constant coefficients</a>, signature (1,4,-4,-5,5,2,-2).
%F A087098 From _Chai Wah Wu_, Feb 02 2021: (Start)
%F A087098 a(n) = a(n-1) + 4*a(n-2) - 4*a(n-3) - 5*a(n-4) + 5*a(n-5) + 2*a(n-6) - 2*a(n-7) for n > 6.
%F A087098 G.f.: x*(-22*x^3 - x^2 + 11*x + 1)/((x - 1)^3*(x + 1)^2*(2*x^2 - 1)). (End)
%t A087098 Accumulate[Rest[With[{nn=30},Riffle[2^Range[0,nn]-1,11Range[0,nn]]]]] (* _Harvey P. Dale_, Feb 13 2017 *)
%Y A087098 Cf. A086848, A087099, A001068.
%K A087098 easy,nonn
%O A087098 0,3
%A A087098 _Jeremy Gardiner_, Aug 10 2003