Numerator of 1/det(M) where M is the n X n matrix with M[i,j] = 1/gcd(i,j).

Terms

a(0) =1a(1) =-2a(2) =3a(3) =-12a(4) =15a(5) =45a(6) =-105a(7) =420a(8) =-1890a(9) =-4725a(10) =10395a(11) =31185a(12) =-135135a(13) =-315315a(14) =-4729725a(15) =4729725a(16) =-80405325a(17) =-723647925a(18) =1527701175a(19) =7638505875a(20) =53469541125a(21) =117632990475a(22) =-245959889175a(23) =-737879667525