A156081 a(n) = #{1 <= k <= ceiling(n/2) : A000002(2k-1) = 1}.

1, 1, 1, 1, 2, 2, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 6, 6, 7, 7, 7, 7, 8, 8, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 11, 11, 12, 12, 12, 12, 12, 12, 13, 13, 14, 14, 14, 14, 15, 15, 15, 15, 16, 16, 17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 19, 19, 20, 20, 20, 20, 20, 20, 21, 21, 21, 21

Offset

1,5

Links

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

Crossrefs

Cf. A000002.

Sequence in context: A331137 A093125 A226390 * A368991 A147954 A105047

Adjacent sequences: A156078 A156079 A156080 * A156082 A156083 A156084

Keyword

nonn

Author

Benoit Cloitre, Feb 03 2009

Status

approved