OFFSET
0,3
COMMENTS
A missing companion to A107789.
MATHEMATICA
Nest[Flatten[#/.{1->2, 2->{1, 1, 4}, 3->4, 4->{2, 3, 3}}]&, {1}, 8] (* Harvey P. Dale, Oct 11 2019 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jul 26 2012
STATUS
approved