A360664 Number of inequivalent n X n matrices using exactly n different symbols, where equivalence means permutations of rows or columns or the symbol set.

1, 1, 4, 121, 316622, 170309112972, 27417944542834007012, 1999576637456562016308833727820, 95614444589289128555388037722252407519896044, 4112190260012069813083100063825969898935642267505877920574871

Offset

0,3

Links

Alois P. Heinz, Table of n, a(n) for n = 0..14

Formula

a(n) = A242106(n,n).

Example

a(2) = 4:
  [1 0]  [1 1]  [1 0]  [1 0]
  [0 0], [0 0], [1 0], [0 1].

Crossrefs

Main diagonal of A242106.

Sequence in context: A362848 A144508 A169972 * A364948 A080179 A268050

Adjacent sequences: A360661 A360662 A360663 * A360665 A360666 A360667

Keyword

nonn

Author

Alois P. Heinz, Feb 15 2023

Status

approved