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 A360512 #17 Feb 22 2023 18:27:07 %S A360512 0,1,2,4,8,13,19,26,34,44,54,66,78,93,107,124,140,160,178,200,220,245, %T A360512 267,294,318,348,374,406,434,469,499,536,568,608,642,684,720,765,803, %U A360512 850,890,940,982,1034,1078,1133,1179,1236,1284,1344,1394,1456,1508,1573,1627,1694,1750 %N A360512 Total number of edges after n generations in hexagonal graph constructed in first quadrant (see Comments in A360501 for precise definition). %H A360512 N. J. A. Sloane, <a href="/A360501/a360501.pdf">Generations 0 to 16 of the graph</a> %F A360512 G.f. = x*(1+x+x^2+3*x^3+2*x^4+x^5+x^6-x^7)/((1-x)*(1-x^2)*(1-x^4)). %Y A360512 Partial sums of A360501. %Y A360512 Cf. A182632, A182838, A182840. %K A360512 nonn %O A360512 0,3 %A A360512 _N. J. A. Sloane_, Feb 09 2023