Sum of logarithmic numbers.

Terms

a(0) =1a(1) =5a(2) =20a(3) =96a(4) =469a(5) =3145a(6) =20684a(7) =173544a(8) =1557105a(9) =16215253a(10) =159346604a(11) =2230085528a(12) =26985045333a(13) =368730610729