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 A244875 #13 Jan 11 2017 18:21:40 %S A244875 1,21,179,938,3612,11242,29947,70855,152720,305330,573812,1023939, %T A244875 1748545,2875153,4574922,7073018,10660515,15707931,22680505,32155320, %U A244875 44840378,61595732,83456781,111659833,147670042,193211824,250301858,321284777,408871655,516181395 %N A244875 Number of magic labelings with magic sum n of 7th graph shown in link. %H A244875 Colin Barker, <a href="/A244875/b244875.txt">Table of n, a(n) for n = 0..1000</a> %H A244875 N. J. A. Sloane, <a href="/A244869/a244869.jpg">Graphs for A244869-A244876.</a> %H A244875 R. P. Stanley, <a href="/A002721/a002721.pdf">Examples of Magic Labelings</a>, Unpublished Notes, 1973 [Cached copy, with permission] %H A244875 <a href="/index/Rec#order_09">Index entries for linear recurrences with constant coefficients</a>, signature (7,-20,28,-14,-14,28,-20,7,-1). %F A244875 G.f.: (1 + 14*x + 52*x^2 + 77*x^3 + 52*x^4 + 14*x^5 + x^6) / ((1 - x)^8*(1 + x)). %F A244875 a(n) = (315*(255+(-1)^n) + 306144*n + 498456*n^2 + 452312*n^3 + 250530*n^4 + 86576*n^5 + 17724*n^6 + 1688*n^7) / 80640. - _Colin Barker_, Jan 11 2017 %o A244875 (PARI) Vec((1 + 14*x + 52*x^2 + 77*x^3 + 52*x^4 + 14*x^5 + x^6) / ((1 - x)^8*(1 + x)) + O(x^40)) \\ _Colin Barker_, Jan 11 2017 %Y A244875 Cf. A244869, A244870, A244871, A244872, A244873, A244874, A244876. %K A244875 nonn,easy %O A244875 0,2 %A A244875 _N. J. A. Sloane_, Jul 08 2014