A105569 Diagonal sums of A105567, as a number triangle.

1, 1, 2, 0, 3, 3, 2, 2, 0, 1, 2, 0, 0, -1, 2, 2, 2, -3, 2, 2, 4, -1, 2, 0, 2, 1, 2, -1, 2, -2, 2, 3, 8, 0, 2, -1, 4, 0, 2, 3, 4, -1, 2, 2, 6, -4, 2, 3, 6, 4, 2, -2, 2, -2, 2, 4, 4, -1, 2, 4, 6, 9, 2, -1, 0, -3, 2, -4, 6, 0, 2, 3, 12, 9, 2, -1, -6, -6, 2, 2, 6, 4, 2, 6, 8, 0, 2, 1, 0, 0, 2, 6, 0, -6, 2, 5, 8, 0, 2, 3, 4

Offset

0,3

Links

Table of n, a(n) for n=0..100.

Formula

a(n)=sum{k=0..floor(n/2), -mu(k(n-2k))}

Crossrefs

Sequence in context: A333303 A326926 A347564 * A068455 A329098 A038073

Adjacent sequences: A105566 A105567 A105568 * A105570 A105571 A105572

Keyword

easy,sign

Author

Paul Barry, Apr 14 2005

Status

approved