Number of invertible octonions over Z/nZ.

Terms

a(0) =1a(1) =128a(2) =4320a(3) =32768a(4) =312000a(5) =552960a(6) =4939200a(7) =8388608a(8) =28343520a(9) =39936000a(10) =194858400a(11) =141557760a(12) =752955840a(13) =632217600a(14) =1347840000a(15) =2147483648a(16) =6565340160a(17) =3627970560a(18) =16089567840a(19) =10223616000a(20) =21337344000a(21) =24941875200a(22) =74905892160a(23) =36238786560a(24) =121875000000a(25) =96378347520