a(n) = Sum_{k=0..n} 8^k * binomial(2*n+1,n-k).
A386957
a(n) = Sum_{k=0..n} 8^k * binomial(2*n+1,n-k).
Terms
- a(0) =1a(1) =11a(2) =114a(3) =1163a(4) =11806a(5) =119646a(6) =1211820a(7) =12271179a(8) =124251318a(9) =1258065866a(10) =12737997724a(11) =128972535582
External references
- oeis: A386957