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 A309302 #8 Jul 23 2019 20:56:42 %S A309302 0,0,0,0,1,3,7,17,46,116,284,677,1595,3730,8610,19680,44580,100272, %T A309302 224144,498104,1101072,2422264,5305804,11576316,25165920,54526160, %U A309302 117776220,253671540,544924088,1167694512,2496450336,5325759912,11338713768,24094766848 %N A309302 (1/10) times the sum of the elements of all subsets of [n] whose sum is divisible by ten. %H A309302 Alois P. Heinz, <a href="/A309302/b309302.txt">Table of n, a(n) for n = 0..1000</a> %H A309302 <a href="/index/Rec#order_18">Index entries for linear recurrences with constant coefficients</a>, signature (6,-12,8,0,6,-36,72,-48,0,-12,72,-144,96,0,8,-48,96,-64). %F A309302 G.f.: -x^4*(160*x^26-80*x^25+8*x^24-28*x^23+12*x^22-208*x^21 +80*x^20 -4*x^19 +48*x^18 -4*x^17 +48*x^16 +12*x^15 -8*x^14-30*x^13 -10*x^12 +40*x^11 -38*x^10 +12*x^9+5*x^8+9*x^7-22*x^6+18*x^5-4*x^4 -3*x^3 -x^2 +3*x-1) / ((2*x-1)^3 *(2*x^5-1)^3). %Y A309302 Column k=10 of A309280. %K A309302 nonn,easy %O A309302 0,6 %A A309302 _Alois P. Heinz_, Jul 21 2019