OFFSET
1,1
LINKS
Eric Weisstein's World of Mathematics, Unordered Factorization
EXAMPLE
For n = 2: 12 = 2 * 6 = 3 * 4.
For n = 3: 60 = 2 * 3 * 10 = 2 * 5 * 6 = 3 * 4 * 5.
For n = 4: 420 = 2 * 3 * 5 * 14 = 2 * 3 * 7 * 10 = 2 * 5 * 6 * 7 = 3 * 4 * 5 * 7.
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Feb 12 2023
EXTENSIONS
a(7)-a(10) from Daniel Suteu, Feb 13 2023
a(11)-a(22) from Bert Dobbelaere, Feb 16 2023
STATUS
approved