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A127772
Row sums of inverse of number triangle A(n,k) = 1/Euler_phi(n+1) if k <= n <= 2k, 0 otherwise.
1
1, 1, 1, 1, 2, -1, 4, -1, 2, 0, 6, -7, 8, -2, 2, -1, 8, -8, 12, -10, 4, 4, 12, -21, 12, 0, 6, -8, 16, -18, 22, -15, 4, 4, 8, -20, 24, -6, 6, -18, 24, -24, 30, -18, 4, 10, 24, -51, 26, -10, 12, -8, 28, -28, 22, -24, 12, 8, 30, -60
OFFSET
0,5
CROSSREFS
Row sums of A127771.
Sequence in context: A140168 A059119 A305333 * A086256 A227964 A057550
KEYWORD
sign
AUTHOR
Paul Barry, Jan 28 2007
STATUS
approved