a(n) = round(log(n)*exp(n)).

Terms

a(0) =0a(1) =5a(2) =22a(3) =76a(4) =239a(5) =723a(6) =2134a(7) =6199a(8) =17804a(9) =50718a(10) =143572a(11) =404430a(12) =1134768a(13) =3173742a(14) =8852663a(15) =24637530a(16) =68436134a(17) =189781720a(18) =525530244a(19) =1453425034a(20) =4015164095a(21) =11081117799a(22) =30554774841a(23) =84183856047a(24) =231774829749a(25) =637705962868