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 A219427 #5 Jul 23 2025 00:26:59 %S A219427 1,1897,44857,1842766,65352789,2284814260,80311501599,2846763071615, %T A219427 101180231915225,3593093772421047,127477235143792772, %U A219427 4521648074836617071,160404051239506589127,5690803494953995807634 %N A219427 Unchanging value maps: number of 7Xn binary arrays indicating the locations of corresponding elements unequal to no horizontal or antidiagonal neighbor in a random 0..2 7Xn array. %C A219427 Row 7 of A219421 %e A219427 Some solutions for n=3 %e A219427 ..1..0..0....1..0..0....1..1..1....0..0..1....0..0..0....1..1..0....1..0..1 %e A219427 ..0..0..0....0..1..0....1..1..0....0..0..0....0..1..0....0..0..0....0..0..1 %e A219427 ..0..0..0....0..0..1....0..0..1....0..0..1....0..0..1....1..0..1....0..0..0 %e A219427 ..0..0..1....0..0..1....1..1..0....1..0..1....0..0..0....0..0..1....1..0..1 %e A219427 ..0..0..1....1..0..0....0..0..0....0..0..0....0..0..0....1..0..0....1..1..1 %e A219427 ..0..0..1....0..1..0....0..0..1....0..0..0....0..0..0....0..0..0....1..1..1 %e A219427 ..1..1..1....0..0..0....1..1..1....0..1..1....0..1..1....1..0..1....1..0..0 %K A219427 nonn %O A219427 1,2 %A A219427 _R. H. Hardin_ Nov 19 2012