OFFSET
1,2
COMMENTS
a(n) is the concatenation a(n) = a(n-1).a(n-2).a(n-3).a(n-4) for n >= 5.
LINKS
Seiichi Manyama, Table of n, a(n) for n = 1..11
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane and Doron Zeilberger, Aug 21 2018
STATUS
approved