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A127173 Square of A054525. 1
1, -2, 1, -2, 0, 1, 1, -2, 0, 1, 4, -2, -2, 0, 0, 1, -2, 0, 0, 0, 0, 0, 1, 0, 1, 0, -2, 0, 0, 0, 1, 1, 0, -2, 0, 0, 0, 0, 0, 1, 4, -2, 0, 0, -2, 0, 0, 0, 0, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

A127173 * [1, 1, 1,...] = mu(n), A008683: (1, -1, -1, 0, -1, -1, 0, 0, 1,...). A127173 * (1, 2, 3,...] = A007431 A127173 * mu(n) = A007428. All columns = A007427: (1, -2, -2, 1, -2, 4, -1, 0, 1, 4,...) interspersed with (k-1) zeros which are not in A007427.

LINKS

Table of n, a(n) for n=1..50.

FORMULA

Square of A054525 A007427 (1, -2, -2, 1, -2, 4, -2, 0, 1,...) in every column k, interspersed with (k-1) zeros.

EXAMPLE

First few rows of the triangle are:

1;

-2, 1;

-2, 0, 1;

1, -2, 0, 1;

-2, 0, 0, 0, 1;

4, -2, 02, 0, 0, 1;

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

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

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

4, -2, 0, 0, -2, 0, 0, 0, 0, 1;

...

CROSSREFS

Cf. A007427, A054525, A008683, A007431, A007428.

Sequence in context: A120728 A092149 A171099 * A035160 A027414 A140083

Adjacent sequences:  A127170 A127171 A127172 * A127174 A127175 A127176

KEYWORD

tabl,sign

AUTHOR

Gary W. Adamson, Jan 06 2007

STATUS

approved

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Last modified September 21 15:13 EDT 2017. Contains 292300 sequences.