A105568 Row sums of A105567, as a number triangle.

1, 2, 1, 4, 4, 0, 4, -2, 2, 0, 0, 2, 2, 4, 2, -2, -4, 10, 0, 4, 0, 2, -2, 6, -2, 6, 2, 6, 0, 8, -2, 4, 4, 6, -2, 6, -8, 8, 10, 4, -2, 6, -4, 4, 4, 10, 4, -2, -4, 2, 0, 12, 2, 6, -4, 2, 2, 12, 6, 0, -8, -8, 14, 10, 2, 10, -10, 8, 10, 8, -2, 0, -2, -8, 8, 12, 2, 6, -10, 2, 10, 10, 10, -12, -8, 6, 0, 8, 8, 2, -12, -2, 2, 16, 10, 0, -2, 0, 16, 12, 6

Offset

0,2

Links

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

Formula

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

Crossrefs

Sequence in context: A338846 A009477 A324658 * A335830 A004175 A136756

Adjacent sequences: A105565 A105566 A105567 * A105569 A105570 A105571

Keyword

easy,sign

Author

Paul Barry, Apr 14 2005

Status

approved