0,5

Hankel transform of A093387.

G.f.: -x^2*(1+x)/(1+x^2)^2; a(n)=floor(n/2)*(sin(n*pi/2)+cos(n*pi/2)).

Sequence in context: A086388 A080513 A111660 this_sequence A168050 A065033 A001057

Adjacent sequences: A127362 A127363 A127364 this_sequence A127366 A127367 A127368

easy,sign

Paul Barry (pbarry(AT)wit.ie), Jan 11 2007