OFFSET
1,1
COMMENTS
4n - a(n) is in {0,2} for n >= 1. The first 20 numbers 4n - a(n) are 0, 2, 2, 2, 2, 2, 2, 0, 2, 2, 2, 0, 2, 2, 0, 2, 2, 2, 2, 0.
LINKS
Clark Kimberling, Table of n, a(n) for n = 1..10000
FORMULA
a(n) = 2*A287374(n) for n >= 1.
MATHEMATICA
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, May 25 2017
STATUS
approved