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 A377003 #9 Oct 12 2024 21:32:48 %S A377003 1,1,3,7,19,46,132,345,951,2457,6198,14816,34126,75057,159176,325021, %T A377003 642473,1230711,2292826,4160165,7370620,12768904,21671722,36080204, %U A377003 59009291,94910598,150300578,234560237,361082376,548722631,823817750 %N A377003 Number of inequivalent 2*n X 6 binary arrays with row sums 3 and column sums n up to row and column permutations. %e A377003 The a(2) = 3 inequivalent matrices are: %e A377003 [ 1 1 1 0 0 0 ] [ 1 1 1 0 0 0 ] [ 1 1 1 0 0 0 ] %e A377003 [ 1 1 1 0 0 0 ] [ 1 1 0 1 0 0 ] [ 1 0 0 1 1 0 ] %e A377003 [ 0 0 0 1 1 1 ] [ 0 0 1 0 1 1 ] [ 0 1 0 1 0 1 ] %e A377003 [ 0 0 0 1 1 1 ] [ 0 0 0 1 1 1 ] [ 0 0 1 0 1 1 ] %Y A377003 Column k=3 of A377007. %Y A377003 Cf. A172556. %K A377003 nonn,more %O A377003 0,3 %A A377003 _Andrew Howroyd_, Oct 12 2024