a(n) = Sum_{i=1..n-1} (2^i*C(i)-a(i)) * (2^(n-i)*C(n-i)-a(n-i)), a(1)=1, where C(i)=A000108(i-1) are Catalan numbers.
A192481
a(n) = Sum_{i=1..n-1} (2^i*C(i)-a(i)) * (2^(n-i)*C(n-i)-a(n-i)), a(1)=1, where C(i)=A000108(i-1) are Catalan numbers.
Terms
- a(0) =1a(1) =1a(2) =6a(3) =29a(4) =162a(5) =978a(6) =6156a(7) =40061a(8) =267338a(9) =1819238a(10) =12576692a(11) =88079378a(12) =623581332a(13) =4455663876a(14) =32090099352a(15) =232711721757
External references
- oeis: A192481