a(n) = largest multiple of n which is < exp(n).

Terms

a(0) =2a(1) =6a(2) =18a(3) =52a(4) =145a(5) =402a(6) =1092a(7) =2976a(8) =8100a(9) =22020a(10) =59873a(11) =162744a(12) =442403a(13) =1202600a(14) =3269010a(15) =8886096a(16) =24154943a(17) =65659968a(18) =178482295a(19) =485165180a(20) =1318815729a(21) =3584912826a(22) =9744803438a(23) =26489122128a(24) =72004899325a(25) =195729609426