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 A048806 #8 Jul 05 2021 02:14:58 %S A048806 1,-1,1,-1,0,4,-24,104,-88,42,536,-7536,32230,-207052,791194,3748874, %T A048806 -15956672,224309712,-757708060,5189018388,-172716308,-386018261228, %U A048806 8480676071664,-124311732591688,323984959211694,-279035374964954,-7837135693672568 %N A048806 Column 0 of A048805. %K A048806 sign %O A048806 0,6 %A A048806 _Christian G. Bower_, Apr 15 1999 %E A048806 More terms from _Sean A. Irvine_, Jul 04 2021