A006536 Switching classes of digraphs. (Formerly M1710)

2, 6, 38, 684, 50224, 13946352, 14061131152, 50947324188128, 666754350781269760, 31763991166456912086656, 5550343429517595744902558208, 3581353054755185129132443153728000

Offset

1,1

References

R. C. Read, personal communication.

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=1..12.

R. C. Read, Letter to N. J. A. Sloane, Oct. 29, 1976

Crossrefs

Cf. A002854, A049313.

Sequence in context: A055704 A005740 A367904 * A057297 A005530 A353535

Adjacent sequences: A006533 A006534 A006535 * A006537 A006538 A006539

Keyword

nonn,nice

Author

N. J. A. Sloane

Extensions

More terms from Vladeta Jovovic, Jul 22 2000

Status

approved