OFFSET
1,2
COMMENTS
A permutation of A111299.
LINKS
C. Colijn and G. Plazzotta, A Metric on Phylogenetic Tree Shapes, Systematic Biology, volume 67, number 1, January 2018, pages 113-126.
F. Goebel, On a 1-1-Correspondence between Rooted Trees and Natural Numbers, Journal of Combinatorial Theory, series B, volume 29, 1980, pages 141-143.
D. W. Matula, A Natural Rooted Tree Enumeration By Prime Factorization, SIAM Review, volume 10, number 2, April 1968, page 273 (also at JSTOR).
Kevin Ryde, PARI/GP Code
FORMULA
PROG
(PARI) See links.
CROSSREFS
KEYWORD
nonn
AUTHOR
Kevin Ryde, Jul 31 2022
STATUS
approved