



1, 1, 3, 1, 0, 5, 0, 3, 0, 7, 1, 0, 0, 0, 9, 1, 3, 5, 0, 0, 11, 1, 0, 0, 0, 0, 0, 13, 0, 0, 0, 7, 0, 0, 0, 15, 0, 0, 5, 0, 0, 0, 0, 0, 17, 1, 3, 0, 0, 9, 0, 0, 0, 0, 19, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 21
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OFFSET

1,3


COMMENTS

Row sums = A140434: (1, 2, 4, 4, 8, 4, 12, 8, 12,...).
Left border = mu(n), A008683.


LINKS

Table of n, a(n) for n=1..66.


FORMULA

Triangle read by rows, A054525 * A127775, 1<=k<=n. Mobius transform of an infinite lower triangular matrix with (1, 3, 5, 7,...) in the main diagonal and the rest zeros.


EXAMPLE

First few rows of the triangle =
1;
1, 3;
1, 0, 5;
0, 3, 0, 7;
1, 0, 0, 0, 9;
1, 3, 5, 0, 0, 11;
1, 0, 0, 0, 0, 0, 13;
...


CROSSREFS

Cf. A127775, A054525, A140434, A008683.
Sequence in context: A207327 A319083 A045406 * A133728 A127627 A154792
Adjacent sequences: A143465 A143466 A143467 * A143469 A143470 A143471


KEYWORD

tabl,sign


AUTHOR

Gary W. Adamson, Aug 17 2008


STATUS

approved



