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 A108150 #5 Mar 17 2019 08:31:46 %S A108150 1,2,2,3,4,6,10,22,46,114,294 %N A108150 Number of different nonnegative values taken by the determinant of a real (0,1)-matrix of order n. %D A108150 For references and links see A089472. %F A108150 a(1)=2, a(n) = (A089472(n) + 1) / 2 for n>1 %Y A108150 A089472 is the main entry for this sequence. Cf. A003432, A013588, A051236. %K A108150 hard,nonn %O A108150 0,2 %A A108150 _William P. Orrick_, Jan 12 2006 %E A108150 a(0)=1 prepended by _Alois P. Heinz_, Mar 17 2019