0,3

Partial sums are A129368.

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

Sequence in context: A074427 A034751 A000623 this_sequence A095853 A027266 A027261

Adjacent sequences: A129366 A129367 A129368 this_sequence A129370 A129371 A129372

easy,nonn

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