Triangle of numbers, called Y(1,3), related to generalized Catalan numbers A064063(n) = C(3;n).

Terms

a(0) =1a(1) =3a(2) =4a(3) =9a(4) =21a(5) =25a(6) =27a(7) =90a(8) =165a(9) =190a(10) =81a(11) =351a(12) =846a(13) =1416a(14) =1606a(15) =243a(16) =1296a(17) =3834a(18) =8082a(19) =12900a(20) =14506a(21) =729a(22) =4617a(23) =16119a(24) =40365a(25) =79065a(26) =122583a(27) =137089a(28) =2187a(29) =16038