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 A261407 #4 Aug 22 2015 12:53:58 %S A261407 1,2,1,24,1,81,1,63057,1,234280024,1 %N A261407 Numbers d_m arising in Cohen et al.'s investigation of "ladder relations" among powers of the Salem number A073011. %C A261407 See Cohen et al. (1992) for precise definition. %D A261407 Cohen, Henri, Leonard Lewin, and Don Zagier. "A sixteenth-order polylogarithm ladder." Experimental Mathematics 1.1 (1992): 25-34. See Table 1. %Y A261407 Cf. A073011. %K A261407 nonn,more %O A261407 2,2 %A A261407 _N. J. A. Sloane_, Aug 22 2015