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A127506 Triangle read by rows: T(n,k) = A054521(n,k)*A000010(k), 1<=k<=n . 0
1, 1, 0, 1, 1, 0, 1, 0, 2, 0, 1, 1, 2, 2, 0, 1, 0, 0, 0, 4, 0, 1, 1, 2, 2, 4, 2, 0, 1, 0, 2, 0, 4, 0, 6, 0, 1, 1, 0, 2, 4, 0, 6, 4, 0, 1, 0, 2, 0, 0, 0, 6, 0, 6, 0 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,9

COMMENTS

Row sums = A053570.

LINKS

Table of n, a(n) for n=1..55.

FORMULA

A054521 * M, as infinite lower triangular matrices; M = phi(n) in the main diagonal and the rest zeros.

EXAMPLE

First few rows of the triangle are:

1;

1, 0;

1, 1, 0;

1, 0, 2, 0;

1, 1, 2, 2, 0;

1, 0, 0, 0, 4, 0;

1, 1, 2, 2, 4, 2, 0;

...

CROSSREFS

Cf. A054521, A000010, A053570.

Sequence in context: A259920 A048881 A026931 * A007968 A236532 A077763

Adjacent sequences:  A127503 A127504 A127505 * A127507 A127508 A127509

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Jan 17 2007

EXTENSIONS

Edited by R. J. Mathar, Jan 09 2008

STATUS

approved

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Last modified October 18 18:58 EDT 2018. Contains 316323 sequences. (Running on oeis4.)