A128017 Expansion of (1+2x+x^2-x^3)/(1-x^2+x^4).

1, 2, 2, 1, 1, -1, -1, -2, -2, -1, -1, 1, 1, 2, 2, 1, 1, -1, -1, -2, -2, -1, -1, 1, 1, 2, 2, 1, 1, -1, -1, -2, -2, -1, -1, 1, 1, 2, 2, 1, 1, -1, -1, -2, -2, -1, -1, 1, 1, 2, 2, 1, 1, -1, -1, -2, -2, -1, -1, 1, 1, 2, 2, 1, 1, -1, -1, -2, -2, -1, -1

Offset

0,2

Comments

Hankel transform of A128014, A128015, A005717(n+1).

Links

Table of n, a(n) for n=0..70.

Index entries for linear recurrences with constant coefficients, signature (0,1,0,-1).

Crossrefs

Cf. A128016.

Sequence in context: A030614 A328615 A128016 * A096285 A328483 A321856

Adjacent sequences: A128014 A128015 A128016 * A128018 A128019 A128020

Keyword

easy,sign

Author

Paul Barry, Feb 11 2007

Status

approved