Expansion of e.g.f. Product_{k>=1} (1 + mu(k)^2*x^k/k!).

Terms

a(0) =1a(1) =1a(2) =1a(3) =4a(4) =4a(5) =11a(6) =67a(7) =29a(8) =260a(9) =876a(10) =3841a(11) =34134a(12) =69774a(13) =152231a(14) =774243a(15) =4182754a(16) =30376720a(17) =409813561a(18) =1056300594a(19) =3175397668a(20) =3655126844a(21) =91668397027a(22) =499871922705