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

1, 2, 18, 39366, 23841243993846402, 81709849111396536877982595092224988258053033320397747014

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)

Extensions

Title improved by Sean A. Irvine, Nov 12 2017