Gaussian column reduction of Hankel matrix for central Delannoy numbers.

Terms

a(0) =1a(1) =3a(2) =1a(3) =13a(4) =6a(5) =1a(6) =63a(7) =33a(8) =9a(9) =1a(10) =321a(11) =180a(12) =62a(13) =12a(14) =1a(15) =1683a(16) =985a(17) =390a(18) =100a(19) =15a(20) =1a(21) =8989a(22) =5418a(23) =2355a(24) =720a(25) =147a(26) =18a(27) =1a(28) =48639a(29) =29953