A007184 a(n) = Product_{k=0..n-1} (2^(2^k - 1) + 1)^C(n,k). (Formerly M2113)

1, 2, 18, 39366, 23841243993846402, 81709849111396536877982595092224988258053033320397747014

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..5.

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

Sequence in context: A066361 A120929 A349886 * A067765 A293242 A321339

Adjacent sequences: A007181 A007182 A007183 * A007185 A007186 A007187

Keyword

nonn

Author

N. J. A. Sloane.

Extensions

Title improved by Sean A. Irvine, Nov 12 2017

Status

approved