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 A278327 #20 May 27 2023 04:15:27 %S A278327 2,3,2,5,4,4,1,5,7,9,3,4,8,2,9,6,2,9,7,0,1,5,2,4,2,7,5,1,8,8,9,7,6,4, %T A278327 6,4,0,3,8,1,7,9,5,8,5,1,2,2,1,9,1,9,5,3,0,3,9,6,7,7,9,2,9,0,4,3,3,8, %U A278327 8,1,2,1,6,4,3,4,1,2,1,1,3,4,2,0,0,4,9,1,5,1,8,5,5,2,6,2,5,9,4,9,9,1,5,5,0 %N A278327 Decimal expansion of 1/e - 1/e^2. %C A278327 The probability, as n = 2^k increases without bound, that a randomized skip list with n elements and p = 1/2 has exactly k levels. %H A278327 Alois P. Heinz, <a href="/A278327/b278327.txt">Table of n, a(n) for n = 0..10000</a> %H A278327 Wikipedia, <a href="https://en.wikipedia.org/wiki/Skip_list">Skip list</a>. %F A278327 Equals 1/A001113 - 1/A072334 = A068985 - A092553. %F A278327 Equals A091131 / A072334 = A091131 * A092553. %e A278327 0.232544157934829629701524275188976464... %t A278327 RealDigits[1/E - 1/E^2, 10, 120][[1]] (* _Amiram Eldar_, May 27 2023 *) %Y A278327 Cf. A001113, A068985, A072334, A091131, A092553, A158466. %K A278327 nonn,cons %O A278327 0,1 %A A278327 _Alois P. Heinz_, Nov 18 2016