The On-Line Encyclopedia of Integer Sequences (OEIS)

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A105569

Diagonal sums of A105567, as a number triangle.
(history; published version)

#2 by Russ Cox at Fri Mar 30 18:59:06 EDT 2012

AUTHOR

_Paul Barry (pbarry(AT)wit.ie), _, Apr 14 2005

Discussion

Fri Mar 30

18:59

OEIS Server: https://oeis.org/edit/global/287

#1 by N. J. A. Sloane at Tue Jul 19 03:00:00 EDT 2005

NAME

Diagonal sums of A105567, as a number triangle.

DATA

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

FORMULA

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

KEYWORD

easy,sign

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Apr 14 2005

STATUS

approved