OFFSET
0,2
EXAMPLE
For example, the run-lengths in 1333 are 13, then the run-lengths of this is 11, then the run-lengths of this is 2, then the run-lengths of this is 1, so this sequence is counted in a(4).
CROSSREFS
KEYWORD
nonn,hard
AUTHOR
Jeffrey Shallit, Oct 01 2010
EXTENSIONS
a(0)-a(10) confirmed and a(11)-a(14) added by John W. Layman, Oct 07 2010
a(15)-a(16) from Alois P. Heinz, Oct 16 2011
STATUS
approved