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 A167752 #6 Aug 10 2015 00:29:17 %S A167752 1,1,1,0,-1,0,1,0,0,-1,0,0,1,0,0,0,1,0,0,0,1,0,0,0,0,1,0,0,0,0,1,0,0, %T A167752 0,0,0,-1,0,0,0,0,0,1,0,0,0,0,0,0,-1 %N A167752 Hankel transform of A167750. %C A167752 The nonzero terms appear to be indexed by the quarter-squares floor((n+1)^2/4) = A002620(n+1). %C A167752 abs(a(n)) = A237347(n) - 2. - _Reinhard Zumkeller_, Mar 18 2014 %Y A167752 Cf. A167753. %K A167752 sign %O A167752 0,1 %A A167752 _Paul Barry_, Nov 10 2009