a(n) = 3 + 7*a(n-2) + sqrt(1 + 48*a(n-2) + 48*a(n-2)^2), with a(1) = 0, a(2) = 0, a(3) = 2.
A103625
a(n) = 3 + 7*a(n-2) + sqrt(1 + 48*a(n-2) + 48*a(n-2)^2), with a(1) = 0, a(2) = 0, a(3) = 2.
Terms
- a(0) =0a(1) =0a(2) =2a(3) =4a(4) =34a(5) =62a(6) =480a(7) =870a(8) =6692a(9) =12124a(10) =93214a(11) =168872a(12) =1298310a(13) =2352090a(14) =18083132a(15) =32760394a(16) =251865544a(17) =456293432a(18) =3508034490a(19) =6355347660a(20) =48860617322a(21) =88518573814a(22) =680540608024
External references
- oeis: A103625