Generalized Catalan triangle, called CM(1,2).

Terms

a(0) =1a(1) =1a(2) =3a(3) =3a(4) =7a(5) =13a(6) =13a(7) =29a(8) =41a(9) =67a(10) =67a(11) =147a(12) =195a(13) =247a(14) =381a(15) =381a(16) =829a(17) =1069a(18) =1277a(19) =1545a(20) =2307a(21) =2307a(22) =4995a(23) =6339a(24) =7379a(25) =8451a(26) =9975a(27) =14589a(28) =14589a(29) =31485