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A105569 Diagonal sums of A105567, as a number triangle. 1
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 (list; graph; refs; listen; history; text; internal format)
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: A094067 A094112 A326926 * A068455 A329098 A038073

Adjacent sequences:  A105566 A105567 A105568 * A105570 A105571 A105572

KEYWORD

easy,sign

AUTHOR

Paul Barry, Apr 14 2005

STATUS

approved

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Last modified April 9 06:53 EDT 2020. Contains 333344 sequences. (Running on oeis4.)