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 A081741 #21 Jun 28 2022 02:50:13
%S A081741 1,2,3,6,9,18,27,54,81,102,126,162,189,243,369,486,567,729,1071,1134,
%T A081741 1323,1458,1462,1539,2187,2538,2889,3213,4374,4617,6561,7749,8262,
%U A081741 8667,13122,14238,15498,19683,24786,27702,28994,32319,34263,39366,40838
%N A081741 Numbers k that divide A005554(k) (the sum of consecutive Motzkin numbers).
%C A081741 All the powers of 3 (A000244) are in the sequence.
%H A081741 Amiram Eldar, <a href="/A081741/b081741.txt">Table of n, a(n) for n = 1..165</a>
%t A081741 s = {1, 2}; k1 = 1; k2 = 2; Do[k3 = (2*n*k2 + (3*n - 9)*k1)/(n + 1); If[Divisible[k3, n], AppendTo[s, n]]; k1 = k2; k2 = k3, {n, 3, 42000}]; s (* _Amiram Eldar_, Jun 28 2022 *)
%Y A081741 Cf. A000244, A001006, A005554.
%K A081741 nonn
%O A081741 1,2
%A A081741 _Benoit Cloitre_, Apr 07 2003