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
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) * A007155(i). - Sean A. Irvine, Nov 05 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
a(5) from Sean A. Irvine, Nov 05 2017
STATUS
approved