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 A007159 M2767 #17 Jul 08 2025 17:01:58
%S A007159 3,8,178,129054,430903911398
%N A007159 Essentially n-ary operations in a certain 3-element algebra.
%D A007159 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 A007159 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H A007159 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)
%F A007159 a(n) = Sum_{i=0..n} (-1)^(n-i) * binomial(n, i) * A007156(i). - _Sean A. Irvine_, Nov 05 2017
%Y A007159 Cf. A007156.
%K A007159 nonn
%O A007159 0,1
%A A007159 _N. J. A. Sloane_