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 A078474 #8 Jul 16 2022 00:54:07 %S A078474 1,1,1,1,2,3,4,5,5,5,5,6,6,6,6,7,7,7,7,8,8,8,8,9,10,11,12,12,12,12,13, %T A078474 14,15,16,16,16,16,17,18,19,20,20,20,20,21,22,23,24,24,24,24,25,25,25, %U A078474 25,26,26,26,26,27,27,27,27,28,29,30,31,31,31,31,32,32,32,32,33,33,33 %N A078474 a(1)=a(2)=a(3)=1, a(n)=n-a(a(n-1))-a(a(n-2))-a(a(n-3)). %C A078474 Conjecture: partial sums of A284680 (verified for n <= 100000). - _Sean A. Irvine_, Jul 16 2022 %Y A078474 Cf. A005206, A003160. %K A078474 nonn %O A078474 1,5 %A A078474 _Reinhard Zumkeller_, Jan 02 2003