Triangle read by rows: Riordan array (1/(1-9x)^(2/3), x/(9x-1)).

Terms

a(0) =1a(1) =6a(2) =-1a(3) =45a(4) =-15a(5) =1a(6) =360a(7) =-180a(8) =24a(9) =-1a(10) =2970a(11) =-1980a(12) =396a(13) =-33a(14) =1a(15) =24948a(16) =-20790a(17) =5544a(18) =-693a(19) =42a(20) =-1a(21) =212058a(22) =-212058a(23) =70686a(24) =-11781a(25) =1071a(26) =-51a(27) =1a(28) =1817640a(29) =-2120580