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 A290313 #11 Aug 03 2017 05:49:30 %S A290313 1,24,145,545,1575,3836,8274,16290,29865,51700,85371,135499,207935, %T A290313 309960,450500,640356,892449,1222080,1647205,2188725,2870791,3721124, %U A290313 4771350,6057350,7619625,9503676,11760399,14446495,17624895,21365200,25744136,30846024,36763265,43596840,51456825,60462921,70744999,82443660,95710810,110710250 %N A290313 Fourth diagonal sequence of the Sheffer triangle A094816 (special Charlier). %C A290313 See A094816 and A290311. %H A290313 Colin Barker, <a href="/A290313/b290313.txt">Table of n, a(n) for n = 0..1000</a> %H A290313 <a href="/index/Rec#order_07">Index entries for linear recurrences with constant coefficients</a>, signature (7,-21,35,-35,21,-7,1). %F A290313 O.g.f: (1 + 17*x - 2*x^2 - x^3)/(1 - x)^7. %F A290313 E.g.f.: exp(x)*(1 + 23*x + 98*x^2/2! + 181*x^3/3! + 170*x^4/4! + 80*x^5/5! + 15*x^6/6!). %F A290313 From _Colin Barker_, Jul 29 2017: (Start) %F A290313 a(n) = (48 + 256*n + 422*n^2 + 303*n^3 + 105*n^4 + 17*n^5 + n^6) / 48. %F A290313 a(n) = 7*a(n-1) - 21*a(n-2) + 35*a(n-3) - 35*a(n-4) + 21*a(n-5) - 7*a(n-6) + a(n-7) for n > 6. %F A290313 (End) %o A290313 (PARI) Vec((1 + 17*x - 2*x^2 - x^3) / (1 - x)^7 + O(x^50)) \\ _Colin Barker_, Jul 29 2017 %Y A290313 Cf. A094816, A290311, A290312. %K A290313 nonn,easy %O A290313 0,2 %A A290313 _Wolfdieter Lang_, Jul 28 2017