Dirichlet convolution of mu(n) with 3^(n-1).

Terms

a(0) =1a(1) =2a(2) =8a(3) =24a(4) =80a(5) =232a(6) =728a(7) =2160a(8) =6552a(9) =19600a(10) =59048a(11) =176880a(12) =531440a(13) =1593592a(14) =4782880a(15) =14346720a(16) =43046720a(17) =129133368a(18) =387420488a(19) =1162241760a(20) =3486783664a(21) =10460294152a(22) =31381059608a(23) =94142999520a(24) =282429536400a(25) =847288078000