A074413 Number of 4-ary Lyndon words of length n over Z_4 with trace 2 and subtrace 3.

0, 0, 2, 6, 16, 44, 128, 440, 1706, 6496, 24576, 90004, 327680, 1198336, 4438966, 16645120, 62914560, 238602228, 905969664, 3442672434, 13102206738, 49977802752, 191126044672, 732649663000, 2814062572336, 10825959342080, 41705086880768, 160862475536676

Offset: 1

Author

Frank Ruskey and Nate Kube, Aug 22 2002

Keywords

• easy
• nonn

Examples

			a(4;2,3)=6 since the six 4-ary Lyndon words of trace 2, subtrace 3 and length 4 are { 0123, 0132, 0213, 0231, 0312, 0321 }.
		

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, A074404, A074405, A074406, A074407, A074408, A074409, A074410, A074411, A074412.

Extensions

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