0,4

G.f. : x(1+2x)/((1-x^2)(1+2x-8x^2)); a(n)=4*2^n/9-4(-4)^n/45-(-1)^n/18-3/10; a(n)=(13-4*J(2n+1))(-1)^n/30+4*J(n)/3-3/10, J(n)=A001045(n); a(n)=sum{k=0..n (-1)^(k+1)*J(k)^2};

Cf. A119283.

Sequence in context: A119575 A167349 A014720 this_sequence A075373 A072470 A053911

Adjacent sequences: A138235 A138236 A138237 this_sequence A138239 A138240 A138241

easy,sign

Paul Barry (pbarry(AT)wit.ie), Mar 07 2008