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 A126950 #2 Mar 31 2012 14:40:14
%S A126950 1,15,39,89,161,271,415,609,849,1151,1511,1945,2449,3039,3711,4481,
%T A126950 5345,6319,7399,8601,9921,11375,12959,14689,16561,18591,20775,23129,
%U A126950 25649,28351,31231,34305,37569,41039,44711,48601,52705,57039,61599,66401
%N A126950 a(1) = 1; for n>1, a(n) = the smallest number p > a(n-1) such that (a(n-1)+p)/2 is a cube.
%F A126950 a(n) = ((2*n +1)*(2*n^2 + 2*n -1)+ 5*(-1)^n)/4; a(n) = a(n-1)+2n^3; G.f. = (1 - 2*x + 14*x^2 - 2*x^3 + x^4)/((1 + x)(1 - x)^4).
%t A126950 Table[((2*n +1)*(2*n^2 + 2*n -1)+ 5*(-1)^n)/4,{n,83}]
%Y A126950 Cf. A081352, A126938.
%K A126950 nonn
%O A126950 1,2
%A A126950 _Zak Seidov_, Mar 18 2007