A109246 Riordan array (1-x-2x^2,x(1-x)).

1, -1, 1, -2, -2, 1, 0, -1, -3, 1, 0, 2, 1, -4, 1, 0, 0, 3, 4, -5, 1, 0, 0, -2, 2, 8, -6, 1, 0, 0, 0, -5, -2, 13, -7, 1, 0, 0, 0, 2, -7, -10, 19, -8, 1, 0, 0, 0, 0, 7, -5, -23, 26, -9, 1, 0, 0, 0, 0, -2, 14, 5, -42, 34, -10, 1, 0, 0, 0, 0, 0, -9, 19, 28, -68, 43, -11, 1, 0, 0, 0, 0, 0, 2, -23, 14, 70, -102, 53, -12, 1, 0, 0, 0, 0, 0, 0, 11, -42, -14

Offset: 0

Author

Paul Barry, Jun 23 2005

Keywords

• easy
• sign
• tabl

Comments

Matrix inverse of A109244. Row sums are A109247. Diagonal sums are A109248.

Examples

			Rows begin
1;
-1,1;
-2,-2,1;
0,-1,-3,1;
0,2,1,-4,1;
0,0,3,4,-5,1