Real part of a complex operation analogous to the factorials.

A121627

Real part of a complex operation analogous to the factorials.

Terms

    a(0) =1a(1) =0a(2) =-12a(3) =-96a(4) =-480a(5) =0a(6) =40320a(7) =645120a(8) =5806080a(9) =0a(10) =-1277337600a(11) =-30656102400a(12) =-398529331200a(13) =0a(17) =0a(21) =0

External references