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

0,4

Comments

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

Links

Table of n, a(n) for n=0..99.

Example

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

Crossrefs

Sequence in context: A251418 A172101 A301365 * A037890 A037898 A037836

Adjacent sequences: A109243 A109244 A109245 * A109247 A109248 A109249

Keyword

easy,sign,tabl

Author

Paul Barry, Jun 23 2005

Status

approved