A001326 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 D(2,n). (Formerly M4317 N1809)

6, 2862, 537157696, 37252918396015625, 1289303099816839265917858176, 32115447190132359991237336502881651018804, 784637716923335095479473759060307277562325323313332617216, 24578381309444114202259488565864018899536000344974197975371115039374528219929

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).

Links

Table of n, a(n) for n=2..9.

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

Sequence in context: A210004 A198667 A225066 * A300851 A089501 A290149

Adjacent sequences: A001323 A001324 A001325 * A001327 A001328 A001329

Keyword

nonn

Author

N. J. A. Sloane

Extensions

Definition improved and more terms from Sean A. Irvine, Oct 01 2015

Status

approved