OFFSET
1,3
COMMENTS
Here multiplication denotes concatenation of strings. This is Gijswijt's sequence, A090822, except we count 'y' blocks as being equivalent as long as their maximal elements are identical.
LINKS
F. J. van de Bult, D. C. Gijswijt, J. P. Linderman, N. J. A. Sloane and Allan Wilks, A Slow-Growing Sequence Defined by an Unusual Recurrence, J. Integer Sequences, Vol. 10 (2007), #07.1.2.
CROSSREFS
KEYWORD
nonn
AUTHOR
J. Taylor (integersfan(AT)yahoo.com), Mar 17 2004
STATUS
approved