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 A209997 #6 Apr 16 2023 20:04:35 %S A209997 0,0,1,8,16,51,59,83,99,123,159,199,215,263,287,359,391,455,479,551, %T A209997 623,671,711,799,831,991,1039,1111,1159,1271,1343,1463,1527,1607,1671, %U A209997 1887,1935,2079,2151,2247,2391 %N A209997 (A209990)/8. %C A209997 See A210000 for a guide to related sequences. %t A209997 (See the Mathematica section at A209981.) %Y A209997 Cf. A210000, A209990. %K A209997 nonn %O A209997 0,4 %A A209997 _Clark Kimberling_, Mar 17 2012