A142971 Triangle read by rows: A061397 with negative signs interleaved with (k-1) zeros.

0, -2, 0, -3, 0, 0, 0, -2, 0, 0, -5, 0, 0, 0, 0, 0, -3, -2, 0, 0, 0, -7, 0, 0, 0, 0, 0, 0, 0, 0, 0, -2, 0, 0, 0, 0, 0, 0, -3, 0, 0, 0, 0, 0, 0, 0, -5, 0, 0, -2, 0, 0, 0, 0, 0, -11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -3, 0, -2, 0, 0, 0, 0, 0, 0, -13, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -7, 0, 0, 0, 0, -2, 0, 0, 0, 0, 0, 0, 0, 0, 0, -5, 0, -3, 0, 0, 0, 0, 0, 0, 0

Offset

1,2

Comments

Except for the first term, row products are given by A062953.

Links

Table of n, a(n) for n=1..117.

Example

Table begins:
0;
-2, 0;
-3, 0, 0;
0,-2, 0, 0;
-5, 0, 0, 0, 0;
0,-3,-2, 0, 0, 0;
-7, 0, 0, 0, 0, 0, 0;
0, 0, 0,-2, 0, 0, 0, 0;
0, 0,-3, 0, 0, 0, 0, 0, 0;

Prog

(Excel) =if(mod(row(); column())=0; lookup(row()/column(); A000027; -A061397); "")

Crossrefs

Cf. A061397, A062953, A008472.

Sequence in context: A079302 A138806 A181105 * A104117 A114511 A085199

Adjacent sequences: A142968 A142969 A142970 * A142972 A142973 A142974

Keyword

sign,tabl

Author

Mats O. Granvik and Gary W. Adamson, Jul 14 2008

Status

approved