Somos-4 sequence: a(0)=a(1)=a(2)=a(3)=1; for n >= 4, a(n) = (a(n-1) * a(n-3) + a(n-2)^2) / a(n-4).
A006720
Somos-4 sequence: a(0)=a(1)=a(2)=a(3)=1; for n >= 4, a(n) = (a(n-1) * a(n-3) + a(n-2)^2) / a(n-4).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =3a(6) =7a(7) =23a(8) =59a(9) =314a(10) =1529a(11) =8209a(12) =83313a(13) =620297a(14) =7869898a(15) =126742987a(16) =1687054711a(17) =47301104551
External references
- oeis: A006720