a(1)=1, a(2)=2, a(3)=3, a(n) = ceiling(sqrt(a(n-1)*a(n-2)*a(n-3))), n>3.
A258967
a(1)=1, a(2)=2, a(3)=3, a(n) = ceiling(sqrt(a(n-1)*a(n-2)*a(n-3))), n>3.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =3a(4) =5a(5) =7a(6) =11a(7) =20a(8) =40a(9) =94a(10) =275a(11) =1017a(12) =5128a(13) =37871a(14) =444415a(15) =9290130a(16) =395420005a(17) =40404949540
External references
- oeis: A258967