A333899 Number of nonequivalent n X n binary matrices with 3 ones in every row and column up to permutation of rows.

1, 0, 0, 1, 1, 22, 550, 16700, 703297, 38135272, 2584332084, 214050246975, 21269928579625, 2497135296996934, 341930210261762434, 54008226638062039798, 9746833030828647070625, 1993080976749664740373600, 458405276998431265342151848, 117814680468332544208002721773

Offset: 0

Author

Andrew Howroyd, Apr 18 2020

Keywords

• nonn

Comments

Number of factorizations of m^3 into n factors, where m is a product of exactly n distinct primes and each factor is a product of 3 distinct primes.

Links

• Andrew Howroyd, Table of n, a(n) for n = 0..100

Crossrefs

Column k=3 of A260340.

Cf. A254243.