A127506 Triangle read by rows: T(n,k) = A054521(n,k)*A000010(k), 1<=k<=n .

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

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: A048881 A026931 A339823 * A353433 A007968 A236532

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