a(n) = 5*n*6^(n-1).

Terms

a(0) =5a(1) =60a(2) =540a(3) =4320a(4) =32400a(5) =233280a(6) =1632960a(7) =11197440a(8) =75582720a(9) =503884800a(10) =3325639680a(11) =21767823360a(12) =141490851840a(13) =914248581120