a(0)=1, a(1)=2 continued recursively a(n) = (n-1)*a(n-1) - a(n-2) if n is even and a(n) = a(n-1) - (n-2)*a(n-2) if n is odd.
A122578
a(0)=1, a(1)=2 continued recursively a(n) = (n-1)*a(n-1) - a(n-2) if n is even and a(n) = a(n-1) - (n-2)*a(n-2) if n is odd.
Terms
- a(0) =1a(1) =2a(2) =1a(3) =-1a(4) =-4a(5) =-1a(6) =-1a(7) =4a(8) =29a(9) =1a(10) =-20a(11) =-29a(12) =-299a(13) =20a(14) =559a(15) =299a(16) =3926a(17) =-559a(18) =-13429a(19) =-3926a(20) =-61165a(21) =13429a(22) =343174a(23) =61165a(24) =1063621a(25) =-343174a(26) =-9642971a(27) =-1063621a(28) =-19074796a(29) =9642971
External references
- oeis: A122578