OFFSET

0,4

COMMENTS

The triangle shows A140825(3) in the first row and fills the n-th row by successively skipping two terms of A140825 and taking the next n terms. The absolute values of the triangle generated this way are symmetric with respect to mirror-operation at the row centers. We are essentially reading numerators down columns of the triangle in A140825, a(i,j), 0<=i<=j-2.

EXAMPLE

The triangle starts:

-1;

1, -1;

-19, 11, -19;

27, -11, 11, -27;

CROSSREFS

KEYWORD

AUTHOR

Paul Curtz, Jul 31 2008

EXTENSIONS

Edited by R. J. Mathar, Aug 12 2008

STATUS

approved