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A074656 Number of Lyndon words (aperiodic necklaces) with 4n beads of 4 colors, n beads of each color. 1
1, 6, 312, 30798, 3941280, 586637250, 96197630040, 16875655269942, 3111284137104000, 595909785174026400, 117634021776545937000, 23797087019979071174574, 4912693780461256332795168, 1031629572413246016139181538, 219809927417367517614451764984 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..14.

Index entries for sequences related to Lyndon words

FORMULA

1/(4n) * sum over d|n of {mu(n/d) * (4d)! / d!^4}.

CROSSREFS

a(n)=A029809(n)*6. a(n) = A074652(n)/4.

Sequence in context: A282373 A123181 A281932 * A233108 A207816 A204462

Adjacent sequences:  A074653 A074654 A074655 * A074657 A074658 A074659

KEYWORD

nonn

AUTHOR

Christian G. Bower, Aug 29 2002

EXTENSIONS

a(0)=1 prepended by Alois P. Heinz, Aug 24 2015

STATUS

approved

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Last modified March 30 10:09 EDT 2020. Contains 333125 sequences. (Running on oeis4.)