Expansion of 1/(1 - Sum_{k>=1} mu(k)*x^k*(1 + x^k)/(1 - x^k)^3).

Terms

a(0) =1a(1) =1a(2) =4a(3) =15a(4) =47a(5) =160a(6) =517a(7) =1721a(8) =5668a(9) =18687a(10) =61687a(11) =203448a(12) =671253a(13) =2214377a(14) =7305308a(15) =24100319a(16) =79506903a(17) =262294336a(18) =865310405a(19) =2854666385a(20) =9417565852a(21) =31068622271a(22) =102495625503a(23) =338133855032