A074404 Number of 4-ary Lyndon words of length n over Z_4 with trace 0 and subtrace 2.

0, 0, 0, 1, 8, 36, 160, 548, 1920, 6496, 23040, 84565, 317440, 1197824, 4508328, 16905344, 63406080, 238602228, 902430720, 3429249843, 13076616480, 49977704448, 191312691200, 733365135860, 2815436626328, 10825959342080, 41694904974720, 160823207301705

Offset: 1

Author

Frank Ruskey and Nate Kube, Aug 22 2002

Keywords

• easy
• nonn

Links

• Max Alekseyev, PARI/GP scripts for miscellaneous math problems
• F. Ruskey, 4-ary Lyndon words with given trace and subtrace

Crossrefs

Cf. A068596, A074403, A074405, A074406, A074407, A074408, A074409, A074410, A074411, A074412, A074413.

Extensions

Terms a(15) onward from Max Alekseyev, Apr 09 2013