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 A301681 #14 Aug 30 2023 21:38:48 %S A301681 1,5,14,29,49,75,107,143,183,229,281,337,399,467,539,615,697,785,877, %T A301681 975,1079,1187,1299,1417,1541,1669,1803,1943,2087,2235,2389,2549,2713, %U A301681 2883,3059,3239,3423,3613,3809,4009,4215,4427,4643,4863,5089,5321,5557,5799,6047,6299,6555,6817,7085,7357,7635,7919,8207,8499,8797 %N A301681 Partial sums of A301680. %C A301681 Linear recurrence and g.f. confirmed by Shutov/Maleev link in A301680. - _Ray Chandler_, Aug 30 2023 %H A301681 Ray Chandler, <a href="/A301681/b301681.txt">Table of n, a(n) for n = 0..1000</a> %H A301681 <a href="/index/Rec#order_09">Index entries for linear recurrences with constant coefficients</a>, signature (2, -1, 0, 0, 0, 0, 1, -2, 1). %F A301681 From _Chai Wah Wu_, Feb 03 2021: (Start) %F A301681 a(n) = 2*a(n-1) - a(n-2) + a(n-7) - 2*a(n-8) + a(n-9) for n > 11. %F A301681 G.f.: -(x + 1)*(x^3 + x + 1)*(-x^7 + x^6 + x^5 + x^4 + 2*x^2 + x + 1)/(x^9 - 2*x^8 + x^7 - x^2 + 2*x - 1). (End) %Y A301681 Cf. A301680. %K A301681 nonn %O A301681 0,2 %A A301681 _N. J. A. Sloane_, Mar 25 2018