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 A049527 #5 Mar 30 2012 17:37:18
%S A049527 1,2,3,6,10,22,39,94,174,464,886,2610
%N A049527 Number of possible sets {{row sums},{column sums}} of an n X n+1 matrix with entries from {0,1,-1} and all row and column sums distinct.
%Y A049527 Cf. A049475, A049526.
%K A049527 nonn,hard,nice
%O A049527 1,2
%A A049527 _Michael Kleber_