Matrix cube of triangle W = A136231; also equals P^9, where P = triangle A136220.

Terms

a(0) =1a(1) =9a(2) =1a(3) =99a(4) =18a(5) =1a(6) =1323a(7) =306a(8) =27a(9) =1a(10) =21036a(11) =5643a(12) =621a(13) =36a(14) =1a(15) =390012a(16) =115917a(17) =14580a(18) =1044a(19) =45a(20) =1a(21) =8287041a(22) =2657946a(23) =366129a(24) =29754a(25) =1575a(26) =54a(27) =1a(28) =198918840a(29) =67708113