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A143354 Triangle read by rows, (A051731)^4 * A128407, 1<=k<=n. 2
1, 4, -1, 4, 0, -1, 10, -4, 0, 0, 4, 0, 0, 0, -1, 16, -4, -4, 0, 0, 1, 4, 0, 0, 0, 0, 0, -1, 20, -10, 0, 0, 0, 0, 0, 0, 10, 0, -4, 0, 0, 0, 0, 0, 0, 16, -4, 0, 0, -4, 0, 0, 0, 0, 1, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 40, -16, -10, 0, 0, 4, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Left border = A007426.

Right border = mu(n), A008683.

Row sums = A007425: (1, 3, 3, 6, 3, 9,...).

LINKS

Table of n, a(n) for n=1..90.

FORMULA

Triangle read by rows, (A051731)^4 * A128407, 1<=k<=n

EXAMPLE

First few rows of the triangle =

1;

4, -1;

4, 0, -1;

10, -4, 0, 0;

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

16, -4, -4, 0, 0, 1;

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

10, -10, 0, 0, 0, 0, 0, 0;

...

CROSSREFS

Cf. A051731, A128407, A007425, A007426, A008663.

Sequence in context: A229672 A298568 A152890 * A324026 A171539 A106141

Adjacent sequences:  A143351 A143352 A143353 * A143355 A143356 A143357

KEYWORD

tabl,sign

AUTHOR

Gary W. Adamson, Aug 10 2008

STATUS

approved

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Last modified May 17 16:03 EDT 2021. Contains 343980 sequences. (Running on oeis4.)