A156249 a(n)=sum(k=1,n,(-1)^k*A000002(2*k-1))

-1, 1, 0, 1, -1, 1, 0, 2, 1, 3, 1, 2, 1, 3, 2, 3, 1, 3, 2, 4, 3, 4, 2, 4, 3, 4, 2, 3, 1, 2, 1, 3, 1, 2, 0, 1, 0, 2, 0, 1, -1, 1, 0, 2, 0, 1, -1, 0, -1, 1, 0, 1, -1, 1, 0, 2, 1, 2, 0, 2, 1, 3, 2, 4, 2, 3, 2, 4, 3, 5, 4, 5, 3, 5, 4, 6, 4, 5, 4, 6, 5, 7, 5, 6, 4, 6, 5, 6, 4, 5, 3, 5, 4, 5, 3, 4, 3, 5, 3, 4

Offset

1,8

Links

Table of n, a(n) for n=1..100.

Crossrefs

Sequence in context: A111376 A241664 A157226 * A187808 A317673 A317954

Adjacent sequences: A156246 A156247 A156248 * A156250 A156251 A156252

Keyword

sign

Author

Benoit Cloitre, Feb 07 2009

Status

approved