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 A333902 Number of nonequivalent 3 X n nonnegative integer matrices with all column sums 3 and row sums n up to permutation of rows. 2
 1, 1, 2, 10, 70, 566, 4781, 41357, 364470, 3257830, 29450557, 268701797, 2470513849, 22862694505, 212758007450, 1989477010250, 18682005254390, 176085344355510, 1665167298000005, 15793406377949405, 150192477267201945, 1431741484334863145, 13678227386467491410 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS Number of factorizations of m^3 into 3 factors, where m is a product of exactly n distinct primes and each factor is a product of n primes (counted with multiplicity). LINKS Andrew Howroyd, Table of n, a(n) for n = 0..100 EXAMPLE The a(2) = 2 matrices are: [1 1] [0 2] [1 1] [1 1] [1 1] [2 0] CROSSREFS Row n=3 of A257462. Sequence in context: A166076 A354307 A217938 * A051405 A005568 A036075 Adjacent sequences: A333899 A333900 A333901 * A333903 A333904 A333905 KEYWORD nonn AUTHOR Andrew Howroyd, Apr 18 2020 STATUS approved

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Last modified February 21 03:13 EST 2024. Contains 370219 sequences. (Running on oeis4.)