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 A183544 #9 Oct 13 2022 15:09:29 %S A183544 1,2,4,5,7,8,9,12,13,14,15,16,20,21,22,23,24,25,26,27,33,34,35,36,37, %T A183544 38,39,40,41,42,43,44,45,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68, %U A183544 69,70,71,72,73,74,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103 %N A183544 Ordering of the numbers in the tree A183542; complement of A183545. %F A183544 The monotonic ordering of the numbers in the set S generated by these rules: 1 is in S, and if n is in S, then -2+Floor[(n+2)r] and n+Floor[(n+2)r] are in S, where r=(1+sqrt(5))/2, the golden ratio. %t A183544 nn=200; g=(1+5^(1/2))/2; t={1}; t0=t; While[t=Select[Union[t,-2+Floor[(t+2)g], t+Floor[(t+2)g]], #<=nn&]; t0 !=t, t0=t];t %o A183544 (Python) %o A183544 from itertools import islice %o A183544 def A183544_gen(): # generator of terms %o A183544 a, b, i = 1, 1, 0 %o A183544 while True: %o A183544 yield from (j+a for j in range(i,i+a)) %o A183544 i += a %o A183544 a, b = b, a+b %o A183544 A183544_list = list(islice(A183544_gen(),30)) # _Chai Wah Wu_, Oct 13 2022 %Y A183544 Cf. A183542, A183543, A183545. %K A183544 nonn %O A183544 1,2 %A A183544 _Clark Kimberling_, Jan 05 2011