a(n) = Sum_{k=0..n} (k+1) * 2^k * binomial(2*k+1,2*n-2*k).
A391895
a(n) = Sum_{k=0..n} (k+1) * 2^k * binomial(2*k+1,2*n-2*k).
Terms
- a(0) =1a(1) =4a(2) =24a(3) =152a(4) =812a(5) =4192a(6) =21312a(7) =106048a(8) =519568a(9) =2516672a(10) =12074112a(11) =57467008a(12) =271692992a(13) =1277193216a(14) =5974321152a(15) =27825801216a(16) =129109422336a(17) =597042549760
External references
- oeis: A391895