Powers of 7 written backwards.

Terms

a(0) =1a(1) =7a(2) =94a(3) =343a(4) =1042a(5) =70861a(6) =946711a(7) =345328a(8) =1084675a(9) =70635304a(10) =942574282a(11) =3476237791a(12) =10278214831a(13) =70401098869a(14) =948270322876