a(n) = n! * Sum_{k=0..floor(n/2)} (k+1)^(k-1) / (2^k * k! * (n-2*k)!).
A362524
a(n) = n! * Sum_{k=0..floor(n/2)} (k+1)^(k-1) / (2^k * k! * (n-2*k)!).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =16a(5) =56a(6) =391a(7) =2017a(8) =20504a(9) =139456a(10) =1867681a(11) =15751451a(12) =262263442a(13) =2638794094a(14) =52589415971a(15) =614628436801
External references
- oeis: A362524