a(n) = Sum_{k=0..n} 4^(n-k) * binomial(n+k-1,k) * binomial(k/2,n-k).
A378554
a(n) = Sum_{k=0..n} 4^(n-k) * binomial(n+k-1,k) * binomial(k/2,n-k).
Terms
- a(0) =1a(1) =1a(2) =7a(3) =28a(4) =171a(5) =846a(6) =4942a(7) =26580a(8) =153363a(9) =856900a(10) =4939682a(11) =28140476a(12) =162676878a(13) =936947116a(14) =5436375532a(15) =31526252208a(16) =183571246659
External references
- oeis: A378554