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 A318630 #6 Aug 30 2018 23:24:18 %S A318630 0,1,24310,1562331,23535820,177232627,886322982,3381098545, %T A318630 10639125640,28987537806,70625252863,157366449604,325949658015, %U A318630 635299897870,1176174344125,2083664997876,3553074951283,5859727868575,9383313282102,14637413449945,22304900540890 %N A318630 Number of 9-member subsets of [9*n] whose elements sum to a multiple of n. %H A318630 Alois P. Heinz, <a href="/A318630/b318630.txt">Table of n, a(n) for n = 0..10000</a> %H A318630 <a href="/index/Rec#order_21">Index entries for linear recurrences with constant coefficients</a>, signature (6,-15,22,-27,36,-42,36,-27,23,-21,21,-23,27,-36,42,-36,27,-22,15,-6,1). %F A318630 G.f.: -x*(9*x^20 +24256*x^19 +1416550*x^18 +14526732*x^17 +58916595*x^16 +142251894*x^15 +245168253*x^14 +328503852*x^13 +372895647*x^12 +386000952*x^11 +387373441*x^10 +386005450*x^9 +372890715*x^8 +328505514*x^7 +245169837*x^6 +142249572*x^5 +58917879*x^4 +14526462*x^3 +1416486*x^2 +24304*x+1) / ((x^6+x^3+1) *(x^2+x+1)^3 *(x-1)^9). %Y A318630 Row n=9 of A318557. %K A318630 nonn,easy %O A318630 0,3 %A A318630 _Alois P. Heinz_, Aug 30 2018