A143612 - OEIS

A143612

Triangle read by rows, A127368 * A000012, 1<=k<=n.

1, 1, 0, 3, 2, 0, 4, 3, 3, 0, 10, 9, 7, 4, 0, 6, 5, 5, 5, 5, 0, 21, 20, 18, 15, 11, 6, 0, 16, 15, 15, 12, 12, 7, 7, 0, 27, 26, 24, 24, 20, 15, 15, 8, 0, 20, 19, 19, 16, 16, 16, 16, 9, 9, 0, 55, 54, 52, 49, 45, 40, 34, 27, 19, 10, 0, 24, 23, 23, 23, 23, 18, 18, 11, 11, 11, 11, 0, 78, 77, 75

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OFFSET

1,4

COMMENTS

Triangle read by rows, A127368 * A000012, 1<=k<=n. Triangle A127368 records the reduced residue system mod n. The operator A000012 takes partial sums starting from the right in A127368 rows.

LINKS

Table of n, a(n) for n=1..81.

EXAMPLE

First few rows of the triangle =

1, 0;

3, 2, 0;

4, 3, 3, 0;

10, 9, 7, 4, 0;

6, 5, 5, 5, 5, 0;

21, 20, 18, 15, 11, 6, 0;

16, 15, 15, 12, 12, 7, 7, 0;

...