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 A055416 #15 Sep 15 2019 13:49:13 %S A055416 1,21,4541,198765,3083569,27634481,164379601,759891589,2839094517, %T A055416 9183188589,26107328109,67602028569,160441685209,357086356401, %U A055416 746545031221,1487788785845,2829595966381,5188248484757,9170828884817 %N A055416 Number of points in Z^10 of norm <= n. %C A055416 Here "norm" is being used in the sense of L_2 norm, as opposed to the definition in SPLAG. - _N. J. A. Sloane_, Sep 29 2007 %D A055416 J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag. %H A055416 Andrew Howroyd, <a href="/A055416/b055416.txt">Table of n, a(n) for n = 0..500</a> %F A055416 a(n) = [x^(n^2)] theta_3(x)^10/(1 - x), where theta_3() is the Jacobi theta function. - _Ilya Gutkovskiy_, Apr 15 2018 %e A055416 To check that a(2) = 4541: %e A055416 norm^2 # total %e A055416 0 1 1 %e A055416 1 20 21 %e A055416 2 180 201 %e A055416 3 960 1161 %e A055416 4 3380 4541 %Y A055416 Column k=10 of A302997. %K A055416 nonn %O A055416 0,2 %A A055416 _David W. Wilson_ %E A055416 Edited by _N. J. A. Sloane_, Sep 29 2007