a(3*n-2) = a(3*n-1) = a(3*n) = b(n), where b(1) = 1, b(2) = -2, b(3) = 0, and b(n+1) = -(m+1)*b(n) - (m-1)*(m-2)*b(n-1) - (m-3)*(m-4)*(m-5)*b(n-2) for m = 3*n.
A123186
a(3*n-2) = a(3*n-1) = a(3*n) = b(n), where b(1) = 1, b(2) = -2, b(3) = 0, and b(n+1) = -(m+1)*b(n) - (m-1)*(m-2)*b(n-1) - (m-3)*(m-4)*(m-5)*b(n-2) for m = 3*n.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =-2a(4) =-2a(5) =-2a(6) =0a(7) =0a(8) =0a(9) =-8a(10) =-8a(11) =-8a(12) =1112a(13) =1112a(14) =1112a(15) =-16336a(16) =-16336a(17) =-16336a(18) =29760a(19) =29760a(20) =29760a(21) =108608a(22) =108608a(23) =108608a(24) =112587520a(25) =112587520a(26) =112587520a(27) =-3584451200a(28) =-3584451200a(29) =-3584451200
External references
- oeis: A123186