a(n) = (a(n-1) * a(n-3) - (-1)^n * a(n-2)^2) / a(n-4) with a(1) = a(3) = a(4) = 1, a(2) = -2.
A247378
a(n) = (a(n-1) * a(n-3) - (-1)^n * a(n-2)^2) / a(n-4) with a(1) = a(3) = a(4) = 1, a(2) = -2.
Terms
- a(0) =1a(1) =-2a(2) =1a(3) =1a(4) =-1a(5) =1a(6) =2a(7) =-3a(8) =-1a(9) =-11a(10) =17a(11) =46a(12) =217a(13) =-143a(14) =2383a(15) =10797a(16) =19054a(17) =497689a(18) =2407303a(19) =-18692747a(20) =-184111831a(21) =-1592624618a(22) =26447728169a(23) =396185367129a(24) =-372098609569
External references
- oeis: A247378