a(0) = 1; a(n) = (1/3) * Sum_{k=1..n} (4^k-1) * a(k-1) * a(n-k).
A376113
a(0) = 1; a(n) = (1/3) * Sum_{k=1..n} (4^k-1) * a(k-1) * a(n-k).
Terms
- a(0) =1a(1) =1a(2) =6a(3) =137a(4) =11938a(5) =4095882a(6) =5599192492
External references
- oeis: A376113
A376113
a(0) = 1; a(n) = (1/3) * Sum_{k=1..n} (4^k-1) * a(k-1) * a(n-k).