Inverse of the Delannoy triangle.

Terms

a(0) =1a(1) =-1a(2) =1a(3) =2a(4) =-3a(5) =1a(6) =-6a(7) =10a(8) =-5a(9) =1a(10) =22a(11) =-38a(12) =22a(13) =-7a(14) =1a(15) =-90a(16) =158a(17) =-98a(18) =38a(19) =-9a(20) =1a(21) =394a(22) =-698a(23) =450a(24) =-194a(25) =58a(26) =-11a(27) =1a(28) =-1806a(29) =3218