A331650 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.

1, 0, 0, 840, 768785, 1493786233, 5254074934990, 29830719723310370, 255792964622656480490, 3156204819384156606884415, 53951801951854013864607338684, 1238521839654509818636854497532129, 37207357446549003419594083481144144755, 1431264458992614322596852782769837314471920

Offset

0,4

Comments

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

Links

Andrew Howroyd, Table of n, a(n) for n = 0..50

Crossrefs

Row n=4 of A331569.

Sequence in context: A091036 A091038 A121498 * A331652 A364179 A269894

Adjacent sequences: A331647 A331648 A331649 * A331651 A331652 A331653

Keyword

nonn

Author

Andrew Howroyd, Jan 24 2020

Status

approved