1,6

Right border = A000010, phi(n).

Row sums = A023896: (1, 1, 3, 4, 10, 6, 21,...).

Triangle read by rows, A054533 * A000012; i.e. partial sums from of the right of triangle A054533.

First few rows of the triangle =

1;

0, 1;

0, 1, 2;

0, 0, 2, 2;

0, 1, 2, 3, 4;

0, -1, 0, 2, 3, 2;

0, 1, 2, 3, 4, 5, 6;

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

0, 0, 0, 3, 3, 3, 6, 6, 6

0, -1, 0, -1, 0, 4, 5, 4, 5, 4

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10;

...

row 4 = (0, 0, 2, 2) = partial sums of row 4, triangle A054533: (0, -2, 0, 2).

A054533, Cf. A000010, A023896

Sequence in context: A099766 A132339 A137676 this_sequence A029361 A107502 A146165

Adjacent sequences: A144731 A144732 A144733 this_sequence A144735 A144736 A144737

tabl,sign

Gary W. Adamson (qntmpkt(AT)yahoo.com), Sep 20 2008