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 A026892 #4 Mar 30 2012 18:56:11 %S A026892 1,19,220,2021,16246,119914,835080,5579147,36150820,228879616, %T A026892 1423367610,8727874180,52919787978,317969615146,1896431659490, %U A026892 11241964305405,66305996581006,389432443869294,2279159225280808 %N A026892 T(2n,n-4), T given by A026780. %K A026892 nonn %O A026892 4,2 %A A026892 _Clark Kimberling_