0,2

A Chebyshev transform of A100087, under the mapping A(x)->((1-x^2)/(1+x^2))A(x/(1+x^2)).

a(n)=(3*2^n+2cos(pi*n/2)+4sin(pi*n/2))/5; a(n)=n*sum{k=0..floor(n/2), binomial(n-k, k)(-1)^k*A100087(n-2k)/(n-k)}.

Sequence in context: A002082 A005304 A152732 this_sequence A025244 A132824 A078801

Adjacent sequences: A100085 A100086 A100087 this_sequence A100089 A100090 A100091

easy,nonn

Paul Barry (pbarry(AT)wit.ie), Nov 03 2004