Number of similarity classes of vectors with minimal Ducci period n.

Terms

a(0) =2a(1) =0a(2) =6a(3) =2a(4) =30a(5) =24a(6) =126a(7) =28a(8) =504a(9) =480a(10) =2046a(11) =990a(12) =8190a(13) =8064a(14) =32730a(15) =4064a(16) =131070a(17) =130536a(18) =524286a(19) =261630a(20) =2097018a(21) =2095104a(22) =8388606a(23) =2096100a(24) =33554400a(25) =33546240a(26) =134217216a(27) =67100670a(28) =536870910a(29) =536837640