Known values (to 70 base8 digits):
a(1) = 0 (base 10) = 0 (base 8)
a(2) = 17892 (base 10) = 42744 (base 8)
a(3) = 1589 (base 10) = 3065 (base 8)
a(4) = 21483 (base 10) = 51753 (base 8)
a(5) = 1022 (base 10) = 1776 (base 8)
a(6) = 7034104602 (base 10) = 64320765432 (base 8)
a(7) = 1445787 (base 10) = 5407633 (base 8)
a(9) = 467364965130 (base 10) = 6632107665412 (base 8)
a(12) = 29921040357642 (base 10) = 663321076654412 (base 8)
