OFFSET
1,2
PROG
(Python3)
k=[{(1, 1)}]
for i in range(20):
k.append(set([(i[0]*i[1], i[1]) for i in k[-1]])|set([(i[0]*(i[1]+1), i[1]+1) for i in k[-1]]))
[len(i) for i in k]
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Jack Zhang, Sep 10 2020
EXTENSIONS
a(31)-a(36) from Bert Dobbelaere, Oct 19 2020
STATUS
approved