OFFSET
0,2
COMMENTS
This is three times A057661. See that entry for much more information.
FORMULA
a(n) = 3*(A057660(n)+1)/2 for n>=1. - Hugo Pfoertner, Feb 17 2021
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Feb 17 2021
STATUS
approved