Positive first differences of the rows of triangle A088459, which enumerates symmetric Dyck paths.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =3a(6) =1a(7) =3a(8) =8a(9) =6a(10) =1a(11) =4a(12) =15a(13) =20a(14) =20a(15) =1a(16) =5a(17) =24a(18) =45a(19) =75a(20) =50a(21) =1a(22) =6a(23) =35a(24) =84a(25) =189a(26) =210a(27) =175a(28) =1a(29) =7