Triangle of coefficients in expansion of (3+5x)^n.

Terms

a(0) =1a(1) =3a(2) =5a(3) =9a(4) =30a(5) =25a(6) =27a(7) =135a(8) =225a(9) =125a(10) =81a(11) =540a(12) =1350a(13) =1500a(14) =625a(15) =243a(16) =2025a(17) =6750a(18) =11250a(19) =9375a(20) =3125a(21) =729a(22) =7290a(23) =30375a(24) =67500a(25) =84375a(26) =56250a(27) =15625a(28) =2187a(29) =25515