a(n) = 111111 in base n.

Terms

a(0) =6a(1) =63a(2) =364a(3) =1365a(4) =3906a(5) =9331a(6) =19608a(7) =37449a(8) =66430a(9) =111111a(10) =177156a(11) =271453a(12) =402234a(13) =579195a(14) =813616a(15) =1118481a(16) =1508598a(17) =2000719a(18) =2613660a(19) =3368421a(20) =4288306a(21) =5399043a(22) =6728904a(23) =8308825a(24) =10172526a(25) =12356631a(26) =14900788a(27) =17847789a(28) =21243690a(29) =25137931