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a(n) = Product_{k=0..n-1} (2^(2^k - 1) + 1)^C(n,k).
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Product _{k=0..n-1} (2^(2^k - 1) + 1)^C(n,k).
Title improved by Sean A. Irvine, Nov 12 2017
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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)
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_N. J. A. Sloane (njas(AT)research.att.com)_.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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N. J. A. Sloane (njas(AT)research.att.com).