a(1) = 1, a(2) = -1, a(3) = 2; for n > 3, a(n) = -(2*n-5)*a(n-1).
A129779
a(1) = 1, a(2) = -1, a(3) = 2; for n > 3, a(n) = -(2*n-5)*a(n-1).
Terms
- a(0) =1a(1) =-1a(2) =2a(3) =-6a(4) =30a(5) =-210a(6) =1890a(7) =-20790a(8) =270270a(9) =-4054050a(10) =68918850a(11) =-1309458150a(12) =27498621150a(13) =-632468286450
External references
- oeis: A129779