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 A188418 #6 Jul 22 2025 11:12:14 %S A188418 1,4,39,723,21965,968230,57967660,4505774905,439923593145, %T A188418 52601045792520 %N A188418 Number of (3*n)Xn binary arrays with rows in nonincreasing order, 3 ones in every column and no more than 3 ones in any row. %C A188418 Row 3 of A188416 %e A188418 All solutions for 6X2 %e A188418 ..1..0....1..1....1..1....1..1 %e A188418 ..1..0....1..1....1..0....1..1 %e A188418 ..1..0....1..0....1..0....1..1 %e A188418 ..0..1....0..1....0..1....0..0 %e A188418 ..0..1....0..0....0..1....0..0 %e A188418 ..0..1....0..0....0..0....0..0 %K A188418 nonn %O A188418 1,2 %A A188418 _R. H. Hardin_ Mar 30 2011