A165204 Hankel transform of A165203.

1, -5, -21, -21, 89, 377, 377, -1597, -6765, -6765, 28657, 121393, 121393, -514229, -2178309, -2178309, 9227465, 39088169, 39088169, -165580141, -701408733, -701408733, 2971215073, 12586269025, 12586269025, -53316291173, -225851433717, -225851433717

Offset: 0

Author

Paul Barry, Sep 07 2009

Keywords

• sign

Comments

Entries are based on F(3n+2).

Formula

Conjectures from Colin Barker, Feb 10 2018: (Start)

G.f.: (1 - 8*x + 2*x^2 - x^3) / (1 - 3*x + 8*x^2 - 3*x^3 + x^4).

a(n) = 3*a(n-1) - 8*a(n-2) + 3*a(n-3) - a(n-4) for n>3.

(End)

Extensions

More terms added, and a(19) corrected by Colin Barker, Feb 10 2018