login
Number of binary matrices with n distinct columns and any number of distinct nonzero rows with 4 ones in every column and columns in decreasing lexicographic order.
2

%I #8 Jan 25 2020 17:56:05

%S 1,0,0,840,768785,1493786233,5254074934990,29830719723310370,

%T 255792964622656480490,3156204819384156606884415,

%U 53951801951854013864607338684,1238521839654509818636854497532129,37207357446549003419594083481144144755,1431264458992614322596852782769837314471920

%N Number of binary matrices with n distinct columns and any number of distinct nonzero rows with 4 ones in every column and columns in decreasing lexicographic order.

%C The condition that the columns be in decreasing order is equivalent to considering nonequivalent matrices with distinct columns up to permutation of columns.

%H Andrew Howroyd, <a href="/A331650/b331650.txt">Table of n, a(n) for n = 0..50</a>

%Y Row n=4 of A331569.

%K nonn

%O 0,4

%A _Andrew Howroyd_, Jan 24 2020