A117354 Riordan array (1-x+sqrt(1-6x+x^2))/2, (1+x-sqrt(1-6x+x^2))/4).

1, -2, 1, -2, -1, 1, -6, -1, 0, 1, -22, -3, 1, 1, 1, -90, -11, 4, 4, 2, 1, -394, -45, 17, 16, 8, 3, 1, -1806, -197, 76, 69, 34, 13, 4, 1, -8558, -903, 353, 313, 153, 59, 19, 5, 1, -41586, -4279, 1688, 1472, 716, 278, 92, 26, 6, 1, -206098, -20793, 8257, 7112, 3448, 1346, 454, 134, 34

Offset

0,2

Comments

First column is A085403. Row sums are A086456. Inverse of A117352.

Links

Table of n, a(n) for n=0..63.

Example

Triangle begins
1,
-2, 1,
-2, -1, 1,
-6, -1, 0, 1,
-22, -3, 1, 1, 1,
-90, -11, 4, 4, 2, 1,
-394, -45, 17, 16, 8, 3, 1

Crossrefs

Sequence in context: A158986 A079900 A188317 * A140324 A323284 A010250

Adjacent sequences: A117351 A117352 A117353 * A117355 A117356 A117357

Keyword

easy,sign,tabl

Author

Paul Barry, Mar 09 2006

Status

approved