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 A031307 #6 Jul 28 2022 03:24:23 %S A031307 8,26,46,66,86,106,126,146,151,153,155,157,159,161,163,165,166,167, %T A031307 169,186,214,244,274,304,334,364,394,424,431,434,437,440,443,446,449, %U A031307 452,454,455,458,484,514,544,574,604,634,664,694 %N A031307 Position of n-th 8 in A031298. %Y A031307 Cf. A031298. %K A031307 nonn %O A031307 1,1 %A A031307 _Clark Kimberling_