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Number of 6 X n binary matrices with no zero rows or columns, up to row and column permutation.
5

%I #10 Feb 28 2023 23:48:27

%S 1,15,180,2001,20755,200082,1781941,14637962,111011667,779695050,

%T 5093379110,31092553357,178203364143,963217652830,4930357535218,

%U 23989343505296,111335037107474,494383391324356,2106346854756098

%N Number of 6 X n binary matrices with no zero rows or columns, up to row and column permutation.

%H Andrew Howroyd, <a href="/A055084/b055084.txt">Table of n, a(n) for n = 1..500</a>

%o (PARI) Vec((G(6, x) - G(5, x))*(1 - x) + O(x^30)) \\ G defined in A028657. - _Andrew Howroyd_, Feb 28 2023

%Y Column k=6 of A056152.

%Y Cf. A024206, A055609, A054976, A048291.

%K nonn

%O 1,2

%A _Vladeta Jovovic_, Jun 13 2000