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 A171659 #11 Feb 02 2023 15:26:51 %S A171659 2,10,-2,100,-30,2,1000,-400,50,-2,10000,-5000,900,-70,2,100000, %T A171659 -60000,14000,-1600,90,-2 %N A171659 Lucas-version of A165293. %e A171659 Triangle begins: %e A171659 2 %e A171659 10,-2 %e A171659 100,-30,2 %e A171659 1000,-400,50,-2 %Y A171659 Cf. A165293, A087799 (antidiagonal sums), A004189. %K A171659 tabl,sign,more %O A171659 1,1 %A A171659 _Mark Dols_, Dec 14 2009