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 A026112 #6 Sep 16 2019 15:41:13 %S A026112 1,1,6,30,160,873,4851,27300,155115,887910,5112767,29582886,171857127, %T A026112 1001762125,5856231825,34320863160,201579530004,1186231850298, %U A026112 6992515244280,41281814341780,244049819182260,1444558452300909,8560106124666867,50777065370076660 %N A026112 a(n) = T(2n,n), where T is the array defined in A026105. %Y A026112 Bisection of A026117. %K A026112 nonn %O A026112 0,3 %A A026112 _Clark Kimberling_ %E A026112 More terms from _Alois P. Heinz_, Sep 16 2019