A156080 a(n) = #{1 <= k <= ceiling(n/2) : A000002(2k-1) = 2}.

0, 0, 1, 1, 1, 1, 1, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 8, 8, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 11, 11, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 15, 15, 16, 16, 16, 16, 17, 17, 17, 17, 17, 17, 18, 18, 19, 19, 19, 19, 20, 20

Offset

1,9

Links

Table of n, a(n) for n=1..82.

Crossrefs

Sequence in context: A331852 A379771 A103128 * A334233 A271058 A107320

Adjacent sequences: A156077 A156078 A156079 * A156081 A156082 A156083

Keyword

nonn

Author

Benoit Cloitre, Feb 03 2009

Status

approved