0,3

Hankel transform of A114464(n) is A160636.

a(n)=(-2)^floor(C(n+1,2)/2).

Sequence in context: A081294 A004171 A009117 this_sequence A150829 A155084 A150830

Adjacent sequences: A160634 A160635 A160636 this_sequence A160638 A160639 A160640

easy,sign

Paul Barry (pbarry(AT)wit.ie), May 21 2009