Decimal repunits written in base 7.

Terms

a(0) =0a(1) =1a(2) =14a(3) =216a(4) =3145a(5) =44252a(6) =641640a(7) =12305251a(8) =163304624a(9) =2516300046a(10) =36351200665a(11) =542225612642