Coefficient of x^2 in the n-th Moebius polynomial (A074586), M(n,x), which satisfies M(n,-1)=mu(n) the Moebius function of n.

A077598

Coefficient of x^2 in the n-th Moebius polynomial (A074586), M(n,x), which satisfies M(n,-1)=mu(n) the Moebius function of n.

Terms

    a(0) =0a(1) =0a(2) =2a(3) =8a(4) =15a(5) =30a(6) =43a(7) =67a(8) =90a(9) =123a(10) =149a(11) =203a(12) =237a(13) =290a(14) =343a(15) =415a(16) =464a(17) =556a(18) =613a(19) =716a(20) =800a(21) =899a(22) =972a(23) =1126a(24) =1218a(25) =1342a(26) =1458a(27) =1616a(28) =1716a(29) =1916

External references