A331720 Number of nonequivalent binary matrices with 4 columns and any number of nonzero rows with n ones in every column up to permutation of rows and columns.

1, 5, 23, 93, 332, 1062, 3117, 8399, 21051, 49451, 109698, 231230, 465900, 901425, 1681989, 3037536

Offset: 0

Author

Andrew Howroyd, Jan 31 2020

Keywords

• nonn
• more

Examples

			The a(1) = 5 matrices are:
  [1 0 0 0]  [1 1 0 0]  [1 1 1 0]  [1 1 0 0]  [1 1 1 1]
  [0 1 0 0]  [0 0 1 0]  [0 0 0 1]  [0 0 1 1]
  [0 0 1 0]  [0 0 0 1]
  [0 0 0 1]
		

Crossrefs

Column k=4 of A331461.