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 A345050 #4 Jun 07 2021 06:50:58 %S A345050 1,0,2,-1,12,0,30,-2,0,-6,90,24,132,-12,0,-3,240,15,306,16,20,-24,462, %T A345050 108,38,-30,-14,0,756,276,870,-4,108,-42,264,152,1260,-48,176,130, %U A345050 1560,348,1722,-56,-60,-60,2070,336,164,-35,360,-96,2652,84,912,136,476,-78,3306,1824,3540,-84,-110,-5,1380,492,4290 %N A345050 a(n) = A345048(n) - A345049(n). %F A345050 a(n) = A345048(n) - A345049(n). %o A345050 (PARI) A345050(n) = (A345048(n) - A345049(n)); %Y A345050 Cf. A345048, A345049, A345051 (positions of zeros). %K A345050 sign %O A345050 1,3 %A A345050 _Antti Karttunen_, Jun 06 2021