Stirling2 triangle with scaled diagonals (powers of 9).

Terms

a(0) =1a(1) =9a(2) =1a(3) =81a(4) =27a(5) =1a(6) =729a(7) =567a(8) =54a(9) =1a(10) =6561a(11) =10935a(12) =2025a(13) =90a(14) =1a(15) =59049a(16) =203391a(17) =65610a(18) =5265a(19) =135a(20) =1a(21) =531441a(22) =3720087a(23) =1974861a(24) =255150a(25) =11340a(26) =189a(27) =1a(28) =4782969a(29) =67493007