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 A055415 #13 Sep 15 2019 13:49:08 %S A055415 1,19,2869,84663,995241,7129227,35372141,140246303,458690081, %T A055415 1318315075,3375505573,7945596055,17282877369,35516896155,68960061837, %U A055415 128236319951,228701936081,394678200083,658850300869,1072056316615 %N A055415 Number of points in Z^9 of norm <= n. %H A055415 Andrew Howroyd, <a href="/A055415/b055415.txt">Table of n, a(n) for n = 0..500</a> %F A055415 a(n) = [x^(n^2)] theta_3(x)^9/(1 - x), where theta_3() is the Jacobi theta function. - _Ilya Gutkovskiy_, Apr 14 2018 %Y A055415 Column k=9 of A302997. %K A055415 nonn %O A055415 0,2 %A A055415 _David W. Wilson_