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 A366724 #6 Oct 18 2023 10:05:45 %S A366724 1,3,8,18,37,70,123,203,318,477,690,968,1323,1768,2317,2985,3788,4743, %T A366724 5868,7182,8705,10458,12463,14743,17322,20225,23478,27108,31143,35612, %U A366724 40545,45973,51928,58443,65552,73290,81693,90798,100643,111267,122710,135013,148218,162368,177507,193680 %N A366724 First index k where A366574(k) = n. %C A366724 See A366574 for further details. %F A366724 Conjectured: for n > 1, a(n) = (n-1)*(n^3 + 3*n^2 - 10*n + 72)/24 . %Y A366724 Cf. A366574. %K A366724 nonn %O A366724 1,2 %A A366724 _Scott R. Shannon_, Oct 17 2023