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 A068757 #8 Jul 30 2017 22:21:24 %S A068757 1,6181,7970825457,2204710243834695807 %N A068757 Number of potential flows in n X n array with integer velocities in -10..10, i.e., number of n X n arrays with adjacent elements differing by no more than 10, counting arrays differing by a constant only once. %Y A068757 By size 3 X 3, ..., 6 X 6 A068744-A068747, by velocity limit 1..14 A068248-A068761, solenoidal flows A068722-A068738. %K A068757 nonn %O A068757 1,2 %A A068757 _R. H. Hardin_, Feb 27 2002