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 A259329 #5 Aug 16 2015 17:30:21 %S A259329 1,1,1,4872,233707130922139265799, %T A259329 26869353034366501299843095760875674032159666449783949888006055355073 %N A259329 Ceiling of ((2^n)!)/(4^(n^2)). %H A259329 C. S. Lorens, <a href="http://dx.doi.org/10.1109/PGEC.1964.263724">Invertible Boolean functions</a>, IEEE Trans. Electron. Computers, EC-13 (1964), 529-541. %H A259329 C. S. Lorens, <a href="/A000722/a000722.pdf">Invertible Boolean functions</a>, IEEE Trans. Electron. Computers, EC-13 (1964), 529-541. [Annotated scan of page 530 only] %K A259329 nonn %O A259329 1,4 %A A259329 _N. J. A. Sloane_, Jun 24 2015