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

Offset: 0

Author

Andrew Howroyd, Feb 02 2020

Keywords

• nonn
• more

Examples

			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.