A122917 Riordan array (1/(1+x+x^2),x/(1+x)^2).

1, -1, 1, 0, -3, 1, 1, 5, -5, 1, -1, -6, 14, -7, 1, 0, 6, -29, 27, -9, 1, 1, -6, 50, -76, 44, -11, 1, -1, 7, -77, 175, -155, 65, -13, 1, 0, -9, 111, -351, 441, -274, 90, -15, 1, 1, 11, -154, 638, -1078, 924, -441

Offset: 0

Author

Paul Barry, Sep 19 2006

Keywords

• easy
• sign
• tabl

Comments

Row sums are A122918. Inverse is A122919.

Examples

			Triangle begins
1,
-1, 1,
0, -3, 1,
1, 5, -5, 1,
-1, -6, 14, -7, 1,
0, 6, -29, 27, -9, 1,
1, -6, 50, -76, 44, -11, 1,
-1, 7, -77, 175, -155, 65, -13, 1
		

Crossrefs

Cf. A122918, A122919.