

A333900


Number of nonequivalent n X n binary matrices with 4 ones in every row and column up to permutation of rows.


3



1, 0, 0, 0, 1, 1, 130, 16700, 3330915, 957659906, 382304435016, 204772106834160, 143299238797934175, 128179127293763395905, 143868740984351881041401, 199438057945979365292917046, 336793287548313747690192184440, 684521312346990661869780271166300
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OFFSET

0,7


COMMENTS

Number of factorizations of m^4 into n factors, where m is a product of exactly n distinct primes and each factor is a product of 4 distinct primes.


LINKS



CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



