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 A086863 #6 Jun 02 2025 00:16:28
%S A086863 4,22,66,137,238,370,533,727,953,1211,1500,1821,2174,2559,2976,3424,
%T A086863 3905,4418,4962,5538,6147,6787,7460,8164,8900,9668,10469,11301,12165,
%U A086863 13061,13989,14950,15942,16966,18022,19110,20230,21383,22567,23783
%N A086863 a(n)=floor{square((1*n^0+1*n^1+2*n^2+4*n^3)/(1*n^0+2*n^1+1*n^2))}.
%e A086863 a(2)=floor{square((1*2^0+1*2^1+2*2^2+4*2^3)/(1*2^0+2*2^1+1*2^2))}=floor{square(4.77778)}=floor(22.8272)=22
%Y A086863 Cf. A086790, A085899.
%K A086863 easy,nonn
%O A086863 1,1
%A A086863 Wang Dan (wangdan01(AT)lycos.com), Aug 20 2003
%E A086863 Definition corrected by _M. F. Hasler_, Jul 23 2007