OFFSET
0,18
COMMENTS
a(0) = 0, because no numbers are needed to form an empty sum, which is zero.
First 2 occurs as a(17), first 3 at a(234), first 4 at a(3266).
LINKS
Antti Karttunen, Table of n, a(n) for n = 0..10132
EXAMPLE
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Dec 16 2015
STATUS
approved