A007158 Essentially n-ary operations in a certain 3-element algebra.

2, 10, 3866, 297538923922, 675089708540070294583609203589639922, 202089899117162771494026986677587201812698520846319037282893739002965043831824039051995734327796615178840634970

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn

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

• 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)

Crossrefs

Cf. A007155.

Formula

a(n) = Sum_{i=0..n} (-1)^(n-i) * binomial(n, i) * A007155(i). - Sean A. Irvine, Nov 05 2017

Extensions

a(5) from Sean A. Irvine, Nov 05 2017