OFFSET
1,2
REFERENCES
A. Salomaa, Jewels of Formal Language Theory. Computer Science Press, Rockville, MD, 1981, p. 6.
FORMULA
Drop first half of each word in A080814.
MATHEMATICA
Join[{1}, Map[FromDigits, SubstitutionSystem[{1->{1, 2}, 2->{2, 1}}, {2}, 7]]] (* Paolo Xausa, Dec 24 2023 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Mar 26 2003
EXTENSIONS
a(8) from Paolo Xausa, Dec 24 2023
STATUS
approved