A331718 - OEIS

A331718

Number of nonequivalent n-column binary matrices with 3 ones in every column and any number of distinct nonzero rows up to permutation of rows and columns.

1, 0, 0, 3, 23, 191, 2203, 31313

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,4

LINKS

Table of n, a(n) for n=0..7.

EXAMPLE

The a(3) = 3 matrices are:

[1, 1, 0] [1, 1, 1] [1, 1, 1]

[1, 0, 1] [1, 1, 0] [1, 1, 0]

[1, 0, 0] [1, 0, 1] [1, 0, 1]

[0, 1, 1] [0, 1, 0] [0, 1, 1]

[0, 1, 0] [0, 0, 1]

[0, 0, 1]

CROSSREFS

Row n=3 of A331510.

Cf. A331717.

Sequence in context: A144479 A074579 A060880 * A093155 A370105 A372506

Adjacent sequences: A331715 A331716 A331717 * A331719 A331720 A331721

KEYWORD

nonn,more

AUTHOR

Andrew Howroyd, Feb 02 2020

STATUS

approved