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 A033174 #10 Jan 28 2020 00:29:32 %S A033174 366,731,1096,1461,1827,2192,2557,2922,3288,3653,4018,4383,4749,5114, %T A033174 5479,5844,6210,6575,6940,7305,7671,8036,8401,8766,9132,9497,9862, %U A033174 10227,10593,10958,11323,11688,12054,12419,12784,13149,13515,13880 %N A033174 Number of days in n years (n=1 is the first leap year). %F A033174 From _Chai Wah Wu_, Jan 27 2020: (Start) %F A033174 See caveat in A033171 formula section. %F A033174 a(n) = a(n-1) + a(n-4) - a(n-5) for n > 5. %F A033174 G.f.: x*(365*x^3 + 365*x^2 + 365*x + 366)/(x^5 - x^4 - x + 1). (End) %Y A033174 Cf. A033171. %K A033174 easy,nonn %O A033174 1,1 %A A033174 _Jeff Burch_