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 A218848 #5 Jul 23 2025 00:07:43 %S A218848 1,1897,44857,1842766,58634265,1948262831,64756459689,2158022097024, %T A218848 72005693397249,2401007959333366,80020956182679940, %U A218848 2666324484059219950,88840855997887519080,2960140859490010750266,98629740626776522570263 %N A218848 Unmatched value maps: number of 7Xn binary arrays indicating the locations of corresponding elements not equal to any horizontal or antidiagonal neighbor in a random 0..1 7Xn array. %C A218848 Row 7 of A218842 %e A218848 Some solutions for n=3 %e A218848 ..1..1..0....1..0..1....0..0..1....0..0..0....1..0..1....0..0..0....1..1..1 %e A218848 ..0..0..0....0..0..1....1..0..0....0..0..0....0..0..0....0..0..0....1..0..0 %e A218848 ..0..0..0....0..0..1....1..0..0....1..0..1....1..0..0....0..0..0....0..1..1 %e A218848 ..0..0..1....1..0..0....1..0..0....1..0..0....1..0..1....0..1..1....1..0..0 %e A218848 ..1..1..1....0..0..0....1..0..0....1..0..1....1..0..0....1..0..0....1..0..1 %e A218848 ..1..0..1....1..0..1....0..0..0....1..1..0....0..0..0....0..0..0....1..1..0 %e A218848 ..0..0..0....1..0..0....0..1..1....0..0..0....0..0..1....0..0..1....0..0..0 %K A218848 nonn %O A218848 1,2 %A A218848 _R. H. Hardin_ Nov 07 2012