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 A381554 #8 Feb 28 2025 08:04:58 %S A381554 1,18,324,2776,34586,575270,10061200,194929482,4115573632,91947761368, %T A381554 2167131637540,53550929019486,1376887129235964,36670419524921146, %U A381554 1007581514656491404,28454294028011307236,823234343053953729538 %N A381554 Number of 2*n X 8 binary arrays with row sums 4 and column sums n, avoiding the patterns 010 and 101 in any row and column. %e A381554 A few solutions for n = 3 are: %e A381554 0 0 0 0 1 1 1 1 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 0 1 1 1 0 0 %e A381554 0 0 0 0 1 1 1 1 0 0 0 1 1 1 1 0 0 1 1 1 0 0 0 1 1 1 0 0 1 1 0 0 %e A381554 0 0 0 0 1 1 1 1 1 0 0 1 1 0 0 1 0 1 1 1 0 0 0 1 1 1 0 0 0 1 1 0 %e A381554 1 1 1 1 0 0 0 0 1 1 1 0 0 0 0 1 1 0 0 1 1 0 0 1 0 1 1 0 0 0 1 1 %e A381554 1 1 1 1 0 0 0 0 1 1 1 0 0 0 0 1 1 0 0 0 1 1 1 0 0 0 1 1 0 0 1 1 %e A381554 1 1 1 1 0 0 0 0 0 1 1 0 0 1 1 0 1 0 0 0 1 1 1 0 0 0 1 1 1 0 0 1 %Y A381554 Cf. A381551, A381553. %K A381554 nonn %O A381554 0,2 %A A381554 _Christoph Koutschan_, Feb 27 2025