a(0) = 1; a(n) = 2 * Sum_{k=0..floor((n-1)/2)} binomial(n-1,2*k) * a(n-2*k-1).
A352279
a(0) = 1; a(n) = 2 * Sum_{k=0..floor((n-1)/2)} binomial(n-1,2*k) * a(n-2*k-1).
Terms
- a(0) =1a(1) =2a(2) =4a(3) =10a(4) =32a(5) =114a(6) =448a(7) =1978a(8) =9472a(9) =48738a(10) =270336a(11) =1595114a(12) =9965568a(13) =65852882a(14) =457326592a(15) =3329243546a(16) =25356271616a(17) =201326396098
External references
- oeis: A352279