

A219678


Number of tripartite partitions of (n,n,n) into triples.


3



1, 5, 66, 686, 6721, 58616, 476781, 3608348, 25781989, 174810494, 1132328205, 7037425172, 42140788751, 243918472743, 1368647208107, 7462686474948, 39626100989332, 205283558905562, 1039263967957447, 5149048724566723, 24998922141116056, 119073277412589351
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OFFSET

0,2


COMMENTS

a(n) is also the number of factorizations of m^n where m is a product of 3 distinct primes. a(1) = 5: (2*3*5)^1 = 30 has 5 factorizations: 30, 5*6, 3*10, 2*3*5, 2*15.


LINKS

Sean A. Irvine, Table of n, a(n) for n = 0..29


EXAMPLE

a(1) = 5: [(1,1,1)], [(1,1,0),(0,0,1)], [(1,0,1),(0,1,0)], [(1,0,0),(0,1,0),(0,0,1)], [(0,1,1),(1,0,0)].


CROSSREFS

Column k=3 of A219727.
Cf. A219560.
Sequence in context: A263786 A169934 A162443 * A297743 A279463 A331721
Adjacent sequences: A219675 A219676 A219677 * A219679 A219680 A219681


KEYWORD

nonn


AUTHOR

Alois P. Heinz, Nov 26 2012


EXTENSIONS

More terms from Sean A. Irvine, Aug 14 2014


STATUS

approved



