A001324 Number of equivalence classes of n-valued Post functions of 2 variables under action of semi-direct product of symmetric group S_2 and complementing group C(2,n). (Formerly M4316 N1808)

6, 1230, 134355076, 5960467529298425, 143255899980867527046714276, 2621669158378151850086910541198116201940, 49039857307708443467467125153076407586398190249948742656

Offset

2,1

References

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

I. Strazdins, On the number of types of l-adic functions (in Russian), Proc. Riga Polytech. Inst. 10, No. 1 (1963), 167-186.

Links

Table of n, a(n) for n=2..8.

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

Crossrefs

Cf. A000616, A001323.

Sequence in context: A172923 A131675 A263437 * A183585 A060706 A052278

Adjacent sequences: A001321 A001322 A001323 * A001325 A001326 A001327

Keyword

nonn

Author

N. J. A. Sloane

Extensions

More terms from Vladeta Jovovic, Aug 09 2000

Status

approved