Triangle of coefficients in expansion of (1+5x)^n.

Terms

a(0) =1a(1) =1a(2) =5a(3) =1a(4) =10a(5) =25a(6) =1a(7) =15a(8) =75a(9) =125a(10) =1a(11) =20a(12) =150a(13) =500a(14) =625a(15) =1a(16) =25a(17) =250a(18) =1250a(19) =3125a(20) =3125a(21) =1a(22) =30a(23) =375a(24) =2500a(25) =9375a(26) =18750a(27) =15625a(28) =1a(29) =35