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A143320 Triangle read by rows, A000012 * A143317; 1<=k<=n. 1
1, 4, -1, 8, -1, -1, 15, -4, -1, 0, 21, -4, -1, 0, -1, 33, -8, -4, 0, -1, 1, 41, -8, -4, 0, -1, 1, -1, 56, -15, -4, 0, -1, 1, -1, 0, 69, -15, -8, 0, -1, 1, -1, 0, 0, 87, -21, -8, 0, -4, 1, -1, 0, 0, 1, 99, -21, -8, 0, -4, 1, -1, 0, 0, 1, -1, 127, -33, -15, 0, -4, 4, -1, 0, 0, 1, -1, 0 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Left border = A024916: (1, 4, 8, 15, 21, 33,...).

Right border = mu(n), A008683.

Row sums = T(n), triangular numbers.

LINKS

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

FORMULA

Triangle read by rows, A000012 * A143317; 1<=k<=n

EXAMPLE

First few rows of the triangle =

1;

4, -1;

8, -1, -1

15, -4, -1, 0;

21, -4, -1, 0, -1;

33, -8, -4, 0, -1, 1;

41, -3, -4, 0, -1, 1, -1;

...

CROSSREFS

Cf. A143317, A008683, A024916.

Sequence in context: A262361 A294791 A084884 * A089146 A297402 A239666

Adjacent sequences:  A143317 A143318 A143319 * A143321 A143322 A143323

KEYWORD

sign,tabl

AUTHOR

Gary W. Adamson, Aug 07 2008

EXTENSIONS

Corrected last few terms. - Stuart Orford (sjorford(AT)gmail.com), Dec 22 2008

STATUS

approved

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Last modified October 15 22:21 EDT 2018. Contains 316252 sequences. (Running on oeis4.)