OFFSET
0,4
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..1000
EXAMPLE
a(1) = 1: 1.
a(2) = 1: 10.
a(3) = 2: 011, 110.
a(4) = 4: 0100, 1000, 1001, 1100.
a(5) = 10: 00101, 01010, 01011, 01101, 10100, 10110, 10111, 11010, 11011, 11101.
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Dec 19 2013
STATUS
approved