OFFSET

1,2

COMMENTS

This sequence is a permutation of the natural numbers, with inverse A347539.

LINKS

EXAMPLE

For n=21, the tree with Matula-Goebel number 21 is as follows, shown with siblings ordered per Beyer and Hedetniemi's canonical form,

root 1 pre-order levels = 1,2,3,3,2,3

| \ which is row 33 of A346913

level=2 2 2 so a(21) = 33

|\ |

level=3 3 3 3

CROSSREFS

KEYWORD

nonn

AUTHOR

Kevin Ryde, Sep 06 2021

STATUS

approved