A001331 Number of n-element algebras with 1 ternary operation. (Formerly M5395 N2344)

1, 130, 1270932917454, 14178431955039102644307345678938144832, 19591572513704791799478942287037427963644425946432640042160816616766795992851260047500, 1672390093955882094725125078968449171301017629802018367164057251590306327375884442617701277598562886114475651122751129803783336384871488080121922759032559677888042592

Offset

1,2

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=1..6.

M. A. Harrison, The number of isomorphism types of finite algebras, Proc. Amer. Math. Soc., 17 (1966), 731-737.

Crossrefs

Cf. A091510.

Sequence in context: A224112 A184283 A246242 * A291620 A356374 A145096

Adjacent sequences: A001328 A001329 A001330 * A001332 A001333 A001334

Keyword

nonn,nice

Author

N. J. A. Sloane.

Extensions

More terms from Pab Ter (pabrlos(AT)yahoo.com), May 06 2004

Status

approved