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 A136563 #9 May 31 2017 07:58:11 %S A136563 1,2,4,-5,13,-30,75,-200,524,-1299,3038,-6762,14482,-30162,61691, %T A136563 -124998,252744,-512805,1047661,-2158235,4481801,-9368303,19674518, %U A136563 -41437744,87399483,-184412912,388975790,-819684340,1724741941,-3621720214,7585569484,-15839701483 %N A136563 Leftmost column of triangle A136561. %C A136563 Requiring that the absolute values of the differences in the difference triangle only occur at most once each leads to the Zorach additive triangle. (See A035312.) The leftmost column of the Zorach additive triangle is A035311. %Y A136563 Cf. A035311, A136561, A136562. %K A136563 sign %O A136563 1,2 %A A136563 _Leroy Quet_, Jan 06 2008 %E A136563 More terms from _Andrey Zabolotskiy_, May 29 2017