OFFSET
0,2
COMMENTS
Note the indexing: the domain starts from 0, while the range excludes zero.
This sequence can be represented as a binary tree. Each left hand child is produced as A005187(n), and each right hand child as A055938(n), when the parent node contains n:
1
|
...................2...................
3 5
4......../ \........6 8......../ \........12
/ \ / \ / \ / \
/ \ / \ / \ / \
/ \ / \ / \ / \
7 9 10 13 15 17 22 27
11 14 16 20 18 21 23 28 26 30 32 36 41 45 50 58
etc.
LINKS
FORMULA
PROG
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Antti Karttunen, Dec 10 2016
STATUS
approved