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 A187465 #6 Jul 22 2025 10:46:46 %S A187465 1272,11684688,3387715318,216668424092,5212823523842,83101128839744 %N A187465 Number of 5X5 0..n arrays with all the 2X2 subblocks nonsingular and the array of 2X2 subblock determinants symmetric. %C A187465 Row 4 of A187462 %K A187465 nonn %O A187465 1,1 %A A187465 _R. H. Hardin_ Mar 10 2011