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 A360393 #23 Mar 27 2023 22:35:42 %S A360393 1,2,4,6,9,13,15,19,22,24,27,31,34,36,40,42,45,49,51,55,58,60,64,66, %T A360393 69,73,76,78,81,85,87,91,94,96,99,103,106,108,112,114,117,121,124,126, %U A360393 129,133,135,139,142,144,148,150,153,157,159,163,166,168,171,175 %N A360393 Complement of A360392. %H A360393 Winston de Greef, <a href="/A360393/b360393.txt">Table of n, a(n) for n = 1..5000</a> %F A360393 A360393(n) = A356133(n-2) + 2 for n>=3 %t A360393 v = 2 + Accumulate[1 + ThueMorse /@ Range[0, 200]]; (* A360392 *) %t A360393 Complement[Range[Max[v]], v] (* A360393 *) %o A360393 (Python) %o A360393 from itertools import islice %o A360393 def A360393_gen(): # generator of terms %o A360393 yield from (1,2) %o A360393 blist, s = [1], 3 %o A360393 while True: %o A360393 c = [3-d for d in blist] %o A360393 blist += c %o A360393 for d in c: %o A360393 yield from range(s+1,s:=s+d) %o A360393 A360393_list = list(islice(A360393_gen(),30)) # _Chai Wah Wu_, Feb 22 2023 %o A360393 (PARI) a(n) = if(n < 3, [1, 2][n], 3*n - 5 - hammingweight(n-3)%2) \\ _Winston de Greef_, Mar 27 2023 %Y A360393 Cf. A026430, A360392-A360405. %K A360393 nonn,easy %O A360393 1,2 %A A360393 _Clark Kimberling_, Feb 05 2023