a(n) = 6*5*4*3*2*1 - 12*11*10*9*8*7 + 18*17*16*15*14*13 - 24*23*22*21*20*19 + ... - (up to the n-th term).

A319889

a(n) = 6*5*4*3*2*1 - 12*11*10*9*8*7 + 18*17*16*15*14*13 - 24*23*22*21*20*19 + ... - (up to the n-th term).

Terms

    a(0) =6a(1) =30a(2) =120a(3) =360a(4) =720a(5) =720a(6) =708a(7) =588a(8) =-600a(9) =-11160a(10) =-94320a(11) =-664560a(12) =-664542a(13) =-664254a(14) =-659664a(15) =-591120a(16) =363600a(17) =12701520a(18) =12701496a(19) =12700968a(20) =12689376a(21) =12446496a(22) =7601040a(23) =-84207600a(24) =-84207570a(25) =-84206730a(26) =-84183240a(27) =-83549880a(28) =-67106880a(29) =343310400

External references