

A333899


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


2



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

0,6


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



CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



