A174108 Hankel transform of A174107 and A061639(n+1).

1, 0, -9, -81, -729, 0, 531441, 43046721, 3486784401, 0, -205891132094649, -150094635296999121, -109418989131512359209, 0, 523347633027360537213511521, 3433683820292512484657849089281

Offset

0,3

Links

Table of n, a(n) for n=0..15.

Formula

a(n)=((1/2-sqrt(2)/4)*(cos(3*pi*n/4)+sin(3*pi*n/4))+(1/2+sqrt(2)/4)*(cos(3*pi*n/4)-sin(3*pi*n/4)))*9^floor((n+1)^2/8).

Crossrefs

Sequence in context: A206694 A125910 A171283 * A254435 A267790 A268014

Adjacent sequences: A174105 A174106 A174107 * A174109 A174110 A174111

Keyword

easy,sign

Author

Paul Barry, Mar 07 2010

Status

approved