OFFSET
0,7
LINKS
EXAMPLE
The first six levels of the binary tree (compare also to the illustrations given at A005940 and A292603):
0
|
...................0...................
0 1
1......../ \........1 2......../ \........2
/ \ / \ / \ / \
/ \ / \ / \ / \
/ \ / \ / \ / \
1 2 3 3 6 4 6 4
2 3 5 5 8 7 11 6 12 12 18 9 31 13 20 8
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Dec 01 2017
STATUS
approved