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 A022824 #9 Mar 25 2013 11:16:50 %S A022824 6,14,23,33,44,55,67,81,93,105,120,133,149,164,177,191,210,222,240, %T A022824 256,270,288,305,322,336,355,373,387,410,421,441,460,478,496,516,530, %U A022824 548,571,587,603,626,643,663,684,700,716,741,758,780,797,815 %N A022824 a(n) = [ (2n+2)/(n-1) ] + [ (2n+4)/(n-2) ] + ... + [ (4n-2)/1 ]. %o A022824 (PARI) a(n) = sum(k=1, n-1, (4*n-2*k)\k); \\ for n>1. _Michel Marcus_, Mar 24 2013 %K A022824 nonn %O A022824 2,1 %A A022824 _Clark Kimberling_