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 A162086 #6 Jul 22 2025 06:49:05 %S A162086 4,86,14178,21907055,348053502590,60704077222861152, %T A162086 122233352821430587249163,2957950981271006387648141644093 %N A162086 Number of n X n 0..3 arrays with rows and columns, considered as 4-ary numbers, in nondecreasing order. %K A162086 nonn %O A162086 1,1 %A A162086 _R. H. Hardin_ Jun 25 2009