A109264 Riordan array (1-x-x^2,x(1-x)).

1, -1, 1, -1, -2, 1, 0, 0, -3, 1, 0, 1, 2, -4, 1, 0, 0, 1, 5, -5, 1, 0, 0, -1, -1, 9, -6, 1, 0, 0, 0, -2, -6, 14, -7, 1, 0, 0, 0, 1, -1, -15, 20, -8, 1, 0, 0, 0, 0, 3, 5, -29, 27, -9, 1, 0, 0, 0, 0, -1, 4, 20, -49, 35, -10, 1, 0, 0, 0, 0, 0, -4, -1, 49, -76, 44, -11, 1, 0, 0, 0, 0, 0, 1, -8, -21, 98, -111, 54, -12, 1

Offset

0,5

Comments

Rows sums are A109265. Diagonal sums are A109266. Inverse is A109267.

Links

Table of n, a(n) for n=0..90.

Example

Rows begin
1;
-1,1;
-1,-2,1;
0,0,-3,1;
0,1,2,-4,1;
0,0,1,5,-5,1;
0,0,-1,-1,9,-6,1;

Crossrefs

Sequence in context: A029371 A114374 A111505 * A322393 A294265 A130507

Adjacent sequences: A109261 A109262 A109263 * A109265 A109266 A109267

Keyword

easy,sign,tabl

Author

Paul Barry, Jun 24 2005

Status

approved