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 A163987 #13 May 30 2020 04:13:15 %S A163987 1,26,8,200,8,200,56,1400,8,200,56,1400,56,1400,392,9800,8,200,56, %T A163987 1400,56,1400,392,9800,56,1400,392,9800,392,9800,2744,68600 %N A163987 First differences of A160119. %H A163987 <a href="/index/Ce#cell">Index entries for sequences related to cellular automata</a> %F A163987 a(2n-1) = 8*A151785(n-1), n >= 2, a(2n) = 200*A151785(n-1), n >= 2. - _Nathaniel Johnston_, Mar 24 2011 %Y A163987 Cf. A160118, A160119, A160379, A160428, A161340, A163989. %K A163987 nonn,more %O A163987 1,2 %A A163987 _Omar E. Pol_, Sep 20 2009 %E A163987 a(8)-a(32) from _Nathaniel Johnston_, Mar 24 2011