A141045 Triangle of subsequences of A140825 with a mirror symmetry.

-1, 1, -1, -19, 11, -19, 27, -11, 11, -27, -863, 271, -191, 271, -863, 1375, -351, 191, -191, 351, -1375, -33953, 7297, -3233, 2497, -3233, 7297, -33953

Offset: 0

Author

Paul Curtz, Jul 31 2008

Keywords

• sign
• tabl
• less

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.

Examples

			The triangle starts:
-1;
1, -1;
-19, 11, -19;
27, -11, 11, -27;
		

Extensions

Edited by R. J. Mathar, Aug 12 2008