Inverse of number triangle A105438.

Terms

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