a(n) = Sum_{k=0..floor(n/2)} n^k * binomial(2*n-2*k-1,n-2*k).
A371836
a(n) = Sum_{k=0..floor(n/2)} n^k * binomial(2*n-2*k-1,n-2*k).
Terms
- a(0) =1a(1) =1a(2) =5a(3) =19a(4) =91a(5) =426a(6) =2190a(7) =11467a(8) =63811a(9) =365806a(10) =2200978a(11) =13677962a(12) =88553726a(13) =591576220a(14) =4093814812a(15) =29164567635a(16) =214244414371
External references
- oeis: A371836