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
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Nov 26 2012
EXTENSIONS
More terms from Sean A. Irvine, Aug 14 2014
STATUS
approved