a(n) = (a(n-1) * a(n-5) + a(n-2) * a(n-4) + a(n-3)^2) / a(n-6), a(0) = a(1) = a(2) = a(3) = 1, a(4) = a(5) = 2.
A227999
a(n) = (a(n-1) * a(n-5) + a(n-2) * a(n-4) + a(n-3)^2) / a(n-6), a(0) = a(1) = a(2) = a(3) = 1, a(4) = a(5) = 2.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =2a(6) =5a(7) =11a(8) =25a(9) =97a(10) =220a(11) =1396a(12) =6053a(13) =30467a(14) =249431a(15) =1381913a(16) =19850884a(17) =160799404a(18) =1942868797a(19) =36133524445a(20) =458473480079
External references
- oeis: A227999