a(n) = number of indecomposable Schur rings over the group Z_{2^n}.
A112951
a(n) = number of indecomposable Schur rings over the group Z_{2^n}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =16a(4) =63a(5) =271a(6) =1225a(7) =5726a(8) =27461a(9) =134461a(10) =669795a(11) =3384945a(12) =17316771a(13) =89518347a(14) =466932059a(15) =2454546192a(16) =12990743783a(17) =69164599115a(18) =370186756425
External references
- oeis: A112951