Logarithmic numbers.

Terms

a(0) =2a(1) =-6a(2) =24a(3) =-80a(4) =450a(5) =-2142a(6) =17696a(7) =-112464a(8) =1232370a(9) =-9761510a(10) =132951192a(11) =-1258797696a(12) =20476388114a(13) =-225380451870