0,3

Hankel transform is A128056. Binomial transform is A128058. Unsigned version is A128014.

a(n)=(-1)^C(n,2)*(C(n,n/2)*(1+(-1)^n)/2+C(n-1,(n-1)/2)*(1-(-1)^n)/2);

Sequence in context: A086442 A071407 A109859 this_sequence A128014 A135401 A129881

Adjacent sequences: A128054 A128055 A128056 this_sequence A128058 A128059 A128060

easy,sign

Paul Barry (pbarry(AT)wit.ie), Feb 13 2007