All differences C(j)-C(i), j>i, of Catalan numbers A000108.

Terms

a(0) =0a(1) =1a(2) =3a(3) =4a(4) =9a(5) =12a(6) =13a(7) =28a(8) =37a(9) =40a(10) =41a(11) =90a(12) =118a(13) =127a(14) =130a(15) =131a(16) =297a(17) =387a(18) =415a(19) =424a(20) =427a(21) =428a(22) =1001a(23) =1298a(24) =1388a(25) =1416a(26) =1425a(27) =1428a(28) =1429a(29) =3432