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 A188419 #6 Aug 19 2022 15:13:54 %S A188419 1,5,81,3217,252493,33313408,6720357785,1943505834628,768799728447441 %N A188419 Number of (4*n) X n binary arrays with rows in nonincreasing order, four 1's in every column and no more than three 1's in any row. %C A188419 Row 4 of A188416. %e A188419 All solutions for 8 X 2 %e A188419 ..1..0....1..1....1..1....1..1....1..1 %e A188419 ..1..0....1..1....1..1....1..0....1..1 %e A188419 ..1..0....1..1....1..1....1..0....1..0 %e A188419 ..1..0....1..1....1..0....1..0....1..0 %e A188419 ..0..1....0..0....0..1....0..1....0..1 %e A188419 ..0..1....0..0....0..0....0..1....0..1 %e A188419 ..0..1....0..0....0..0....0..1....0..0 %e A188419 ..0..1....0..0....0..0....0..0....0..0 %Y A188419 Cf. A188416. %K A188419 nonn %O A188419 1,2 %A A188419 _R. H. Hardin_, Mar 30 2011