A007157 Essentially n-ary operations in Kleene free algebra. (Formerly M3695)

0, 4, 74, 43682, 160297810086

Offset

0,2

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) * A007154(i). - Sean A. Irvine, Nov 05 2017

Crossrefs

Cf. A007154.

Sequence in context: A358568 A139112 A100865 * A000857 A240007 A046057

Adjacent sequences: A007154 A007155 A007156 * A007158 A007159 A007160

Keyword

nonn

Author

N. J. A. Sloane.

Extensions

Title improved by Sean A. Irvine, Nov 05 2017

Status

approved