A056668 - OEIS

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A056668

Number of equivalence classes of 4-valued Post functions of n variables under action of symmetric group S_n.

1

256, 2148007936, 56713727820157015040139002378207625216, 558658663747608212482251041591910255311640242524683057405682390247387063055565341158714756695500587176090293978181121308657577535237991794589785900711936

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..4.

M. A. Harrison and R. G. High, On the cycle index of a product of permutation groups, J. Combin. Theory, 4 (1968), 277-299. See p. 295.

CROSSREFS

Cf. A000616, A001321, A001322, A001323, A001324.

Sequence in context: A017300 A017420 A017552 * A087930 A245490 A185981

Adjacent sequences: A056665 A056666 A056667 * A056669 A056670 A056671

KEYWORD

nonn

AUTHOR

Vladeta Jovovic, Aug 09 2000

STATUS

approved