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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. 2
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 A241886 A096649

Adjacent sequences:  A331715 A331716 A331717 * A331719 A331720 A331721

KEYWORD

nonn,more

AUTHOR

Andrew Howroyd, Feb 02 2020

STATUS

approved

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Last modified July 30 07:18 EDT 2021. Contains 346348 sequences. (Running on oeis4.)