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 A068596 Number of 4-ary Lyndon words whose trace and subtrace are both 0 mod 4. 11
 1, 0, 1, 1, 11, 44, 169, 588, 1948, 6560, 23133, 84565, 317755, 1198336, 4509419, 16909184, 63409935, 238609052, 902444517, 3429249843, 13076666409, 49977802752, 191312873561, 733365845820, 2815437297416, 10825960652800, 41694907460224, 160823207301705 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 COMMENTS The trace of a word is the sum of its characters; the subtrace of a word is the sum of all products of pairs of its characters. LINKS Max Alekseyev, PARI/GP scripts for miscellaneous math problems CROSSREFS Cf. A074403, A074404, A074405, A074406, A074407, A074408, A074409, A074410, A074411, A074412, A074413. Sequence in context: A299286 A022816 A120537 * A002089 A042521 A041228 Adjacent sequences:  A068593 A068594 A068595 * A068597 A068598 A068599 KEYWORD nonn AUTHOR Frank Ruskey, Mar 28 2002 EXTENSIONS Terms a(15) onward from Max Alekseyev, Apr 09 2013 STATUS approved

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Last modified January 22 04:27 EST 2020. Contains 331133 sequences. (Running on oeis4.)