OFFSET
1,4
COMMENTS
Positions of ones is given by the positive Fibonacci numbers: 1, 2, 3, 5, 8, 13, 21, ..., that is, A000045(n) from n >= 2 onward.
Positions of 2's is given by Lucas numbers larger than 3: 4, 7, 11, 18, ..., that is, A000032(n) from n >= 3 onward.
The restricted growth sequence transform of this sequence (almost certainly) is A003603.
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..17710
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, May 13 2018
STATUS
approved