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 A146198 #7 Dec 18 2015 18:17:14 %S A146198 0,40,5606,41698,158360,453388,1097036,2364072,4672136,8626500, %T A146198 15071228,25146736,40353752,62623676,94395340,138698168,199241736, %U A146198 280511732,387872316,527674880,707373208 %N A146198 Number of n X n arrays of squares of integers with every (n-1)X(n-1) subblock summing to 6 and every element equal to at least one neighbor. %F A146198 Empirical (for n>=7): a(n) = 80*n^6/9 - 401*n^5/3 + 10112*n^4/9 - 5809*n^3 + 145814*n^2/9 - 64942*n/3 + 11612. - _Vaclav Kotesovec_, Nov 30 2012 %K A146198 nonn %O A146198 3,2 %A A146198 _R. H. Hardin_ Apr 14 2009