A052281 Number of 4 X 4 symmetric stochastic matrices under row and column permutations.

1, 1, 3, 6, 16, 29, 62, 107, 195, 320, 522, 804, 1234, 1804, 2626, 3700, 5155, 7038

Offset: 0

Author

Vladeta Jovovic, Feb 06 2000

Keywords

• more
• nonn
• unkn

Comments

This sequence appears to be an erroneous version of A333886.

Examples

			There are 6 nonisomorphic symmetric 4 X 4 matrices with row and column sums 3:
[0 0 0 3] [0 0 1 2] [0 0 1 2] [0 0 1 2] [0 0 1 2] [0 1 1 1]
[0 0 3 0] [0 0 2 1] [0 1 1 1] [0 1 2 0] [0 2 1 0] [1 0 1 1]
[0 3 0 0] [1 2 0 0] [1 1 1 0] [1 2 0 0] [1 1 0 1] [1 1 0 1]
[3 0 0 0] [2 1 0 0] [2 1 0 0] [2 0 0 1] [2 0 1 0] [1 1 1 0]
But, A333886 gives 6 other cases.
		

Crossrefs

Cf. A053493, A001496, A052280, A052282.