a(-1) = a(0) = 0, a(1) = 1; a(n) = 5a(n-1) - 5a(n-2) + a(n-3) + 2*(-1)^(n+1), alternatively a(n) = 3a(n-1) + 3a(n-2) - a(n-3).
A109437
a(-1) = a(0) = 0, a(1) = 1; a(n) = 5a(n-1) - 5a(n-2) + a(n-3) + 2*(-1)^(n+1), alternatively a(n) = 3a(n-1) + 3a(n-2) - a(n-3).
Terms
- a(0) =0a(1) =1a(2) =3a(3) =12a(4) =44a(5) =165a(6) =615a(7) =2296a(8) =8568a(9) =31977a(10) =119339a(11) =445380a(12) =1662180a(13) =6203341a(14) =23151183a(15) =86401392a(16) =322454384a(17) =1203416145a(18) =4491210195a(19) =16761424636a(20) =62554488348a(21) =233456528757a(22) =871271626679
External references
- oeis: A109437