Inverse of number triangle A(n,k) = 1/n! if k <= n <= 2k, 0 otherwise.

Terms

a(0) =1a(1) =0a(2) =1a(3) =0a(4) =-1a(5) =2a(6) =0a(7) =1a(8) =-2a(9) =6a(10) =0a(11) =0a(12) =0a(13) =-6a(14) =24a(15) =0a(16) =-1a(17) =2a(18) =0a(19) =-24a(20) =120a(21) =0a(22) =0a(23) =0a(24) =0a(25) =0a(26) =-120a(27) =720a(28) =0a(29) =1