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A047832 Number of self-complementary binary relations on a 2n-element set. 6
2, 36, 5600, 11220000, 293293716992, 102484848265030656, 491247277315343649710080, 32966971058719932671168222859264, 31464896751148469761776612436741418123264 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

REFERENCES

Wille D., Enumeration of self-complementary structures, J. Comb. Theory B 25 (1978) 143-150.

CROSSREFS

a(n) = A000171(4*n+1).

Sequence in context: A203021 A001070 A095229 * A004003 A060739 A134366

Adjacent sequences:  A047829 A047830 A047831 * A047833 A047834 A047835

KEYWORD

nonn,nice

AUTHOR

Vladeta Jovovic (vladeta(AT)eunet.rs)

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Last modified February 14 01:35 EST 2012. Contains 205567 sequences.