a(1) = 11, a(2) = 19, a(3) = 89, a(4) = 151; for n >= 5, a(n) = sqrt(a(n-4)^2 + 60*a(n-2)^2 + 4*a(n-2)*sqrt(210 + 15*a(n-4)^2)).
A103201
a(1) = 11, a(2) = 19, a(3) = 89, a(4) = 151; for n >= 5, a(n) = sqrt(a(n-4)^2 + 60*a(n-2)^2 + 4*a(n-2)*sqrt(210 + 15*a(n-4)^2)).
Terms
- a(0) =11a(1) =19a(2) =89a(3) =151a(4) =701a(5) =1189a(6) =5519a(7) =9361a(8) =43451a(9) =73699a(10) =342089a(11) =580231a(12) =2693261a(13) =4568149a(14) =21203999a(15) =35964961a(16) =166938731a(17) =283151539a(18) =1314305849a(19) =2229247351a(20) =10347508061a(21) =17550827269a(22) =81465758639a(23) =138177370801a(24) =641378561051
External references
- oeis: A103201