a(n) = Sum_{k=0..n} binomial(2^k + n-k-1, n-k); equals the row sums of triangle A137153.
A137154
a(n) = Sum_{k=0..n} binomial(2^k + n-k-1, n-k); equals the row sums of triangle A137153.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =9a(4) =24a(5) =79a(6) =331a(7) =1803a(8) =12954a(9) =123983a(10) =1592513a(11) =27604172a(12) =648528166a(13) =20722205191a(14) =903019659239
External references
- oeis: A137154