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A350606
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a(n) is the number of elements in row n of A350605.
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1
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1, 3, 7, 15, 30, 60, 119, 237, 472, 940, 1874, 3740, 7469, 14918, 29805, 59561, 119043, 237966, 475750, 951213, 1901981, 3803271, 7605468, 15209251, 30415896, 60827703, 121648985, 243287862, 486559789, 973094453, 1946149237
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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COMMENTS
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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
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LINKS
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PROG
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(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))
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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