6-Modular Catalan Numbers C_{n,6}.

Terms

a(0) =1a(1) =1a(2) =2a(3) =5a(4) =14a(5) =42a(6) =132a(7) =428a(8) =1420a(9) =4796a(10) =16432a(11) =56966a(12) =199444a(13) =704146a(14) =2504000a(15) =8960445a(16) =32241670a(17) =116580200a(18) =423372684a(19) =1543542369a(20) =5647383786a(21) =20728481590a(22) =76305607480a(23) =281648344965