A156726 a(n)=A156253(2n-1)-A156251(2n-1).

0, 0, 0, 2, 2, 4, 4, 4, 4, 4, 6, 6, 8, 8, 8, 10, 10, 12, 12, 12, 12, 14, 14, 16, 16, 18, 18, 18, 18, 18, 20, 20, 22, 22, 22, 22, 24, 24, 26, 26, 26, 28, 28, 28, 30, 30, 30, 30, 32, 32, 32, 34, 34, 36, 36, 36, 36, 38, 38, 40, 40, 40, 40, 40, 42, 42, 44, 44, 44, 44, 44, 46, 46, 48

Offset: 1

Author

Benoit Cloitre, Feb 14 2009

Keywords

• nonn

Comments

a(n) is even.

Formula

a(n) is expected to be asymptotic to 2n/3.