OFFSET
0,2
COMMENTS
It would be nice to have a formula or recurrence!
LINKS
Zoran Sunic, Young tableaux and other mutually describing sequences, Journal of Integer Sequences, Vol. 5 (2002), Article 02.1.5
Zoran Sunic, Self-Describing Sequences and the Catalan Family Tree, Electronic Journal of Combinatorics, 10 (2003) #N5.
EXAMPLE
The ten double points for n=3 form the following 5 pairs: (0000,0123), (0003,0120), (0020,0103), (0023,0100), (0021,0101)
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Zoran Sunic, Jun 24 2002
EXTENSIONS
More terms from John W. Layman, Jul 01 2002
STATUS
approved