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

Terms

a(0) =0a(1) =5a(2) =22a(3) =75a(4) =238a(5) =722a(6) =2133a(7) =6198a(8) =17804a(9) =50717a(10) =143571a(11) =404430a(12) =1134767a(13) =3173741a(14) =8852663a(15) =24637529a(16) =68436134a(17) =189781720a(18) =525530244a(19) =1453425033a(20) =4015164094a(21) =11081117798a(22) =30554774841a(23) =84183856047a(24) =231774829749a(25) =637705962868