a(n) = x(n) * 2^((n mod 2 - 1)/2), with x(n)=Sum(x(k)*x(n-k-1):0<=k<n), x(0)=SQRT(2).

A137697

a(n) = x(n) * 2^((n mod 2 - 1)/2), with x(n)=Sum(x(k)*x(n-k-1):0<=k<n), x(0)=SQRT(2).

Terms

    a(0) =1a(1) =2a(2) =4a(3) =20a(4) =56a(5) =336a(6) =1056a(7) =6864a(8) =22880a(9) =155584a(10) =537472a(11) =3762304a(12) =13312768a(13) =95091200a(14) =342328320a(15) =2481880320a(16) =9051563520a(17) =66378132480

External references