A001322 Number of equivalence classes of n-valued Post functions of 2 variables under action of symmetric group S_2. (Formerly M4884 N2094)

12, 10206, 2148007936, 149011627197265625, 5157212399256236248406163456, 128461788760529439274299006884487791149204, 3138550867693340381917894873863110037264541113810027544576

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. A003180, A001321.

Sequence in context: A343699 A346717 A012732 * A159411 A074983 A159413

Adjacent sequences: A001319 A001320 A001321 * A001323 A001324 A001325

Keyword

nonn

Author

N. J. A. Sloane

Extensions

More terms from Vladeta Jovovic, Aug 09 2000

Status

approved