a(n) = Sum_{k=0..n} 8^k * binomial(2*n,n-k).
A386960
a(n) = Sum_{k=0..n} 8^k * binomial(2*n,n-k).
Terms
- a(0) =1a(1) =10a(2) =102a(3) =1036a(4) =10502a(5) =106380a(6) =1077276a(7) =10908096a(8) =110447046a(9) =1118286172a(10) =11322685172a(11) =114642332232
External references
- oeis: A386960