This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A007155 M2055 #16 Jul 08 2025 17:01:36 %S A007155 2,12,3888,297538935552,675089708540070294583610393745358848, %T A007155 202089899117162771494026986677587201812698520846319037282893739002965043835199487594696085800714664172178112512 %N A007155 (2^(2^n))*(3^(3^n - 2^n)). %D A007155 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 A007155 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A007155 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 A007155 [seq((2^(2^n))*(3^(3^n - 2^n)),n=0..5)]; %K A007155 nonn %O A007155 0,1 %A A007155 _N. J. A. Sloane_