Triangle of coefficients in expansion of (1+6x)^n.

Terms

a(0) =1a(1) =1a(2) =6a(3) =1a(4) =12a(5) =36a(6) =1a(7) =18a(8) =108a(9) =216a(10) =1a(11) =24a(12) =216a(13) =864a(14) =1296a(15) =1a(16) =30a(17) =360a(18) =2160a(19) =6480a(20) =7776a(21) =1a(22) =36a(23) =540a(24) =4320a(25) =19440a(26) =46656a(27) =46656a(28) =1a(29) =42