A007159 Essentially n-ary operations in a certain 3-element algebra. (Formerly M2767)

3, 8, 178, 129054, 430903911398

Offset

0,1

References

J. Berman, ``Free spectra of 3-element algebras,'' in R. S. Freese and O. C. Garcia, editors, Universal Algebra and Lattice Theory (Puebla, 1982), Lect. Notes Math. Vol. 1004, 1983.

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..4.

J. Berman, Free spectra of 3-element algebras, R. S. Freese and O. C. Garcia, editors, Universal Algebra and Lattice Theory (Puebla, 1982), Lect. Notes Math. Vol. 1004, 1983. (Annotated scanned copy)

Formula

a(n) = Sum_{i=0..n} (-1)^(n-i) * binomial(n, i) * A007156(i). - Sean A. Irvine, Nov 05 2017

Crossrefs

Cf. A007156.

Sequence in context: A076147 A132563 A065061 * A081466 A092592 A162185

Adjacent sequences: A007156 A007157 A007158 * A007160 A007161 A007162

Keyword

nonn

Author

N. J. A. Sloane.

Status

approved