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 A244874 #16 Jun 30 2022 18:29:22
%S A244874 1,17,137,707,2709,8417,22408,53008,114251,228431,429325,766167,
%T A244874 1308451,2151643,3423880,5293736,7979133,11757477,16977097,24070067,
%U A244874 33566489,46110317,62476800,83591624,110551831,144648595,187391933,240537431,306115063,386460183,484246768
%N A244874 Number of magic labelings with magic sum n of 6th graph shown in link.
%H A244874 Colin Barker, <a href="/A244874/b244874.txt">Table of n, a(n) for n = 0..1000</a>
%H A244874 N. J. A. Sloane, <a href="/A244869/a244869.jpg">Graphs for A244869-A244876.</a>
%H A244874 R. P. Stanley, <a href="/A002721/a002721.pdf">Examples of Magic Labelings</a>, Unpublished Notes, 1973 [Cached copy, with permission]
%H A244874 <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 A244874 G.f.: (1 + 10*x + 38*x^2 + 60*x^3 + 38*x^4 + 10*x^5 + x^6) / ((1 - x)^8*(1 + x)).
%F A244874 a(n) = (-315*(-129+(-1)^n) + 138528*n + 202104*n^2 + 171248*n^3 + 93030*n^4 + 32312*n^5 + 6636*n^6 + 632*n^7) / 40320. - _Colin Barker_, Jan 11 2017
%t A244874 LinearRecurrence[{7,-20,28,-14,-14,28,-20,7,-1},{1,17,137,707,2709,8417,22408,53008,114251},40] (* _Harvey P. Dale_, Jun 30 2022 *)
%o A244874 (PARI) Vec((1 + 10*x + 38*x^2 + 60*x^3 + 38*x^4 + 10*x^5 + x^6) / ((1 - x)^8*(1 + x)) + O(x^40)) \\ _Colin Barker_, Jan 11 2017
%Y A244874 Cf. A244869, A244870, A244871, A244872, A244873, A244875, A244876.
%K A244874 nonn,easy
%O A244874 0,2
%A A244874 _N. J. A. Sloane_, Jul 08 2014