First column of inverse of Delannoy triangle.

Terms

a(0) =1a(1) =-1a(2) =2a(3) =-6a(4) =22a(5) =-90a(6) =394a(7) =-1806a(8) =8558a(9) =-41586a(10) =206098a(11) =-1037718a(12) =5293446a(13) =-27297738a(14) =142078746a(15) =-745387038a(16) =3937603038a(17) =-20927156706a(18) =111818026018a(19) =-600318853926