OFFSET
0,2
LINKS
Sean A. Irvine, Table of n, a(n) for n = 0..10000
M. Cook and M. Kleber, Tournament sequences and Meeussen sequences, Electronic J. Comb. 7 (2000), #R44.
FORMULA
Top node is 1; each node k has children labeled k+1, k+2, ..., 2k at next level.
EXAMPLE
Irregular triangle begins:
1;
2;
3,4;
4,5,6,5,6,7,8;
...
CROSSREFS
KEYWORD
nonn,easy,nice,tabf
AUTHOR
N. J. A. Sloane, Dec 02 2000
STATUS
approved