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 A290465 #7 Aug 09 2017 14:55:59 %S A290465 0,0,0,0,0,-2,0,-21,2,-39,30,-144,88,-118,176,-187,374,-731,651,-194, %T A290465 1013,-89,1605,-1404,2327,325,3315,695,4627,-5271,6215,2050,8093,3091, %U A290465 10411,-161,13392,6187,16748,8140,20833,-4072,25480,13633,30634,17212,36806,9537,43478,25716,51266,31113,60168 %N A290465 a(n) = A006561(n) - A290447(n). %C A290465 A006561 and A290447 are closely related problems. The former is well-understood, while the latter is at present a mystery. %Y A290465 Cf. A006561, A290447, A290461. %K A290465 sign %O A290465 1,6 %A A290465 _N. J. A. Sloane_, Aug 09 2017