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A011266 2^(n*(n-1)/2)*n!. 3
1, 1, 4, 48, 1536, 122880, 23592960, 10569646080, 10823317585920, 24936923717959680, 127677049435953561600, 1438154284846580917862400, 35344079704389572637386342400, 1882001556099335963795547960115200 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

REFERENCES

R. P. Stanley, Acyclic orientations of graphs, Discrete Math. 5 (1973), 171-178.

LINKS

Table of n, a(n) for n=0..13.

MATHEMATICA

Table[2^((n(n-1))/2) n!, {n, 0, 20}] (* Harvey P. Dale, Dec 16 2012 *)

CROSSREFS

Sequence in context: A191952 A013145 A013150 * A197927 A100568 A112693

Adjacent sequences:  A011263 A011264 A011265 * A011267 A011268 A011269

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified October 19 04:40 EDT 2019. Contains 328211 sequences. (Running on oeis4.)