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A143319 Triangle read by rows, A051731 * A143318; 1<=k<=n. 1
1, 3, -1, 4, -1, -1, 7, -4, 0, 0, 6, -1, -1, -1, -1, 12, -8, -3, 1, 1, 1, 8, -1, -1, -1, -1, -1, -1, 15, -11, 0, 0, 0, 0, 0, 0, 13, -5, -5, 0, 0, 0, 0, 0, 0, 18, -10, -3, -3, -3, 1, 1, 1, 1, 1, 12, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 28, -27, -4, 4, 4, 4, 0, 0, 0, 0, 0, 0 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Left border = sigma(n), A000203.

Right border = mu(n) A008683.

Row sums = d(n), A000005.

LINKS

Table of n, a(n) for n=1..78.

FORMULA

Triangle read by rows, A051731 * A143318; 1<=k<=n

EXAMPLE

First few rows of the triangle =

1;

3, -1;

4, -1, -1;

7, -4, 0, 0;

6, -1, -1, -1, -1;

12, -8, -3, -1, -1, -1;

8, -1, -1, -1, -1, -1, -1;

...

CROSSREFS

Cf. A143318, A000005, A008683, A000203, A051731.

Sequence in context: A130314 A127057 A143355 * A078011 A010285 A159878

Adjacent sequences:  A143316 A143317 A143318 * A143320 A143321 A143322

KEYWORD

tabl,sign

AUTHOR

Gary W. Adamson, Aug 07 2008

STATUS

approved

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Last modified February 24 06:13 EST 2018. Contains 299597 sequences. (Running on oeis4.)