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 A020496 #12 Jul 08 2025 07:48:15 %S A020496 1,4,19,55,181,461 %N A020496 From the ground state energy of a variant of the Hubbard Hamiltonian for 2 holes on a lattice of n sites. %H A020496 C. B. Li and D. C. Mattis, <a href="https://doi.org/10.1142/S0217984997000165">t-J Model with Infinite-Ranged Hopping</a>, Mod. Phys. Lett. B, 11 (1997), 115-121. %K A020496 nonn,more %O A020496 4,2 %A A020496 _M. Lawrence Glasser_ and Don Matthis (Utah)