OFFSET
0,4
COMMENTS
See Baccherini et al. for precise definition.
LINKS
D. Baccherini, D. Merlini, R. Sprugnoli, Binary words excluding a pattern and proper Riordan arrays, Discrete Math. 307 (2007), no. 9-10, 1021--1037. MR2292531 (2008a:05003). See page 1036.
CROSSREFS
KEYWORD
sign,more
AUTHOR
N. J. A. Sloane, Mar 25 2014
STATUS
approved