a(n) where a(n)=-a(-n), a(1)=a(2)=a(3)=a(4)=1, and a(n+2)*a(n-2) = a(n+1)*a(n-1) - c(n)*a(n)^2 where c(3*k)=-2, else c(n)=1.
A320769
a(n) where a(n)=-a(-n), a(1)=a(2)=a(3)=a(4)=1, and a(n+2)*a(n-2) = a(n+1)*a(n-1) - c(n)*a(n)^2 where c(3*k)=-2, else c(n)=1.
Terms
- a(0) =0a(1) =1a(2) =1a(3) =1a(4) =1a(5) =3a(6) =2a(7) =-7a(8) =-13a(9) =-25a(10) =3a(11) =-173a(12) =-332a(13) =1237a(14) =2149a(15) =12969a(16) =-34411a(17) =212159a(18) =729350a(19) =-5405899a(20) =2412231a(21) =-129451889a(22) =951511591a(23) =-6624402137a(24) =-19829335448a(25) =484740289833
External references
- oeis: A320769