9-Modular Catalan Numbers C_{n,9}.

Terms

a(0) =1a(1) =1a(2) =2a(3) =5a(4) =14a(5) =42a(6) =132a(7) =429a(8) =1430a(9) =4862a(10) =16795a(11) =58773a(12) =207907a(13) =742220a(14) =2670564a(15) =9674496a(16) =35256723a(17) =129164090a(18) =475418625a(19) =1757248194a(20) =6519768464a(21) =24272733060a(22) =90648139140a(23) =339497371575