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%I M2113 #17 Nov 12 2017 16:27:53
%S 1,2,18,39366,23841243993846402,
%T 81709849111396536877982595092224988258053033320397747014
%N a(n) = Product_{k=0..n-1} (2^(2^k - 1) + 1)^C(n,k).
%D 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.
%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H J. Berman, <a href="/A007153/a007153.pdf">Free spectra of 3-element algebras</a>, R. S. Freese and O. C. Garcia, editors, Universal Algebra and Lattice Theory (Puebla, 1982), Lect. Notes Math. Vol. 1004, 1983. (Annotated scanned copy)
%K nonn
%O 0,2
%A _N. J. A. Sloane_.
%E Title improved by _Sean A. Irvine_, Nov 12 2017
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