A Chebyshev transform of the little Schroeder numbers A001003.

Terms

a(0) =1a(1) =1a(2) =2a(3) =9a(4) =37a(5) =156a(6) =695a(7) =3203a(8) =15118a(9) =72739a(10) =355475a(11) =1759624a(12) =8804341a(13) =44457125a(14) =226256114a(15) =1159387253a(16) =5976713665a(17) =30974296468a(18) =161285018771a(19) =843388543471