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 A026050 #5 Jun 22 2013 15:31:58 %S A026050 59,78,102,132,170,217,273,339,417,508,612,730,864,1015,1183,1369, %T A026050 1575,1802,2050,2320,2614,2933,3277,3647,4045,4472,4928,5414,5932, %U A026050 6483,7067,7685,8339,9030,9758,10524,11330,12177,13065,13995,14969,15988,17052,18162,19320,20527,21783,23089 %N A026050 a(n) = (d(n)-r(n))/2, where d = A026049 and r is the periodic sequence with fundamental period (1,0,0,1). %F A026050 Conjecture: G.f. x^7*( 59-158*x+203*x^2-202*x^3+145*x^4-45*x^5 ) / ( (x^2+1)*(x-1)^4 ). - _R. J. Mathar_, Jun 22 2013 %K A026050 nonn %O A026050 7,1 %A A026050 _Clark Kimberling_