a(0) = 0; a(1) = 1; if n is odd then a(n) = 2*a(n-1) - (n-1)*a(n-2) otherwise a(n) = 2*(a(n-1) - (n-2)*a(n-2)).
A122598
a(0) = 0; a(1) = 1; if n is odd then a(n) = 2*a(n-1) - (n-1)*a(n-2) otherwise a(n) = 2*(a(n-1) - (n-2)*a(n-2)).
Terms
- a(0) =0a(1) =1a(2) =2a(3) =2a(4) =-4a(5) =-16a(6) =0a(7) =96a(8) =192a(9) =-384a(10) =-3840a(11) =-3840a(12) =69120a(13) =184320a(14) =-1290240a(15) =-5160960a(16) =25804800a(17) =134184960a(18) =-557383680a(19) =-3530096640a(20) =13005619200a(21) =96613171200a(22) =-326998425600
External references
- oeis: A122598