A000663 Number of relations on an infinite set. (Formerly M1932 N0763)

1, 2, 9, 37, 183, 933, 5314, 32043, 207212, 1415934, 10200289, 77018442, 607474564, 4987909231, 42519634303, 375395726926

Offset

0,2

Comments

See the lowest row in the table given on top of page 66 in the Oberschelp reference.

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=0..15.

W. Oberschelp, Kombinatorische Anzahlbestimmungen in Relationen, Math. Ann., 174 (1967), 53-78.

Crossrefs

Sequence in context: A150991 A150992 A151310 * A364088 A218942 A218943

Adjacent sequences: A000660 A000661 A000662 * A000664 A000665 A000666

Keyword

nonn,nice,more

Author

N. J. A. Sloane

Extensions

More terms from Vladeta Jovovic, Jan 10 2000

Status

approved