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 A349821 #10 Jul 09 2025 04:57:29 %S A349821 0,1,5,7,11,19,31,47,79,103,159,191,239,303,383,479,511,767,831,863, %T A349821 895,959,991,1119,1311,1343,1503,1631,1791,1983,2367,2559,2687,2879, %U A349821 2943,3391,4415,4671,4735,4799,5439,6463,6591,6719,7359,9343,11263,12415,21503,23039,36607,50687,51967,56319,56831,63231,64767 %N A349821 a(n) = A230624(n)/2. %C A349821 The definition of A230624 implies that all its terms are even. %Y A349821 Cf. A230624, A349820. %K A349821 nonn %O A349821 1,3 %A A349821 _N. J. A. Sloane_, Dec 30 2021