First denominator and then numerator of the central elements of the 1/3-Pascal triangle (by row).

Terms

a(0) =1a(1) =1a(2) =3a(3) =1a(4) =3a(5) =8a(6) =1a(7) =10a(8) =3a(9) =110a(10) =3a(11) =406a(12) =1a(13) =504a(14) =1a(15) =1892a(16) =1a(17) =7150a(18) =1a(19) =27170a(20) =3a(21) =311168a(22) =3a(23) =1192516a(24) =1a(25) =1528436a(26) =3a(27) =17681020a(28) =3a(29) =68346800