a(n) = (a(n-1) + a(n-3)) * a(n-2) / a(n-4). a(1) = a(2) = a(3) = a(4) = 1.
A078918
a(n) = (a(n-1) + a(n-3)) * a(n-2) / a(n-4). a(1) = a(2) = a(3) = a(4) = 1.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =3a(6) =8a(7) =30a(8) =132a(9) =1400a(10) =23595a(11) =1107260a(12) =198172975a(13) =156753667213
External references
- oeis: A078918