OFFSET
1,2
COMMENTS
It would be nice to have a formula.
Conjecture: a(n) is approximately = k*2^(n-5) for n>4. - Bill McEachen, Jul 30 2024
PROG
(Python)
from itertools import chain, islice
def A350606_gen(): # generator of terms
s = {1}
while True:
yield len(s)
s = set(chain.from_iterable((x, 2*x+1, 3*x+1) for x in s))
CROSSREFS
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Jan 12 2022
EXTENSIONS
a(14)-a(31) from Chai Wah Wu, Jan 12 2022
STATUS
approved