cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-1 of 1 results.

A007157 Essentially n-ary operations in Kleene free algebra.

Original entry on oeis.org

0, 4, 74, 43682, 160297810086
Offset: 0

Views

Author

N. J. A. Sloane

Keywords

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. A007154.

Formula

a(n) = Sum_{i=0..n} (-1)^(n-i) * binomial(n, i) * A007154(i). - Sean A. Irvine, Nov 05 2017

Extensions

Title improved by Sean A. Irvine, Nov 05 2017
Showing 1-1 of 1 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.