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 A354041 #7 May 19 2022 16:42:15 %S A354041 0,1,3,14,30,31,252,508,1020,511,1535,2047,4095,8191,16383,49151,65535 %N A354041 a(n) is the earliest term of A353709 with Hamming weight n. %C A354041 This sequence is not strictly increasing. %H A354041 Rémy Sigrist, <a href="/A354041/a354041.txt">C++ program</a> %F A354041 a(n) = A353709(A354040(n)). %e A354041 For n = 3: %e A354041 - the first terms of A353709, alongside their Hamming weight, are: %e A354041 k | 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17 %e A354041 A353709(k) | 0, 1, 2, 4, 8, 3, 16, 12, 32, 17, 6, 40, 64, 5, 10, 48, 65, 14 %e A354041 h(A353709(k)) | 0, 1, 1, 1, 1, 2, 1, 2, 1, 2, 2, 2, 1, 2, 2, 2, 2, 3 %e A354041 - the first term of A353709 with Hamming weight 3 is A353709(17) = 14, %e A354041 - so a(3) = 14. %o A354041 (C++) See Links section. %Y A354041 Cf. A000120, A353709, A354040. %K A354041 nonn,base,more %O A354041 0,3 %A A354041 _Rémy Sigrist_, May 15 2022