OFFSET
1,2
COMMENTS
By definition the trajectory ends when 1 is reached, so row 1 does not contain the cycle 1 -> 4 -> 2 -> 1.
See A375265 for links.
LINKS
Paolo Xausa, Table of n, a(n) for n = 1..12824 (rows 1..300 of the triangle, flattened).
EXAMPLE
Triangle begins:
1;
2, 1;
3, 1;
4, 2, 1;
5, 16, 8, 4, 2, 1;
6, 2, 1;
7, 22, 11, 34, 17, 52, 26, 13, 40, 20, 10, 5, 16, 8, 4, 2, 1;
8, 4, 2, 1;
9, 3, 1;
10, 5, 16, 8, 4, 2, 1;
...
MATHEMATICA
CROSSREFS
KEYWORD
nonn,tabf,easy
AUTHOR
Paolo Xausa, Aug 08 2024
STATUS
approved