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(2^(2^n))*(3^(3^n - 2^n)).
(Formerly M2055)
1

%I M2055 #12 Nov 07 2017 18:22:59

%S 2,12,3888,297538935552,675089708540070294583610393745358848,

%T 202089899117162771494026986677587201812698520846319037282893739002965043835199487594696085800714664172178112512

%N (2^(2^n))*(3^(3^n - 2^n)).

%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)

%p [seq((2^(2^n))*(3^(3^n - 2^n)),n=0..5)];

%K nonn

%O 0,1

%A _N. J. A. Sloane_.