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 A216955 #54 Aug 02 2014 06:15:37
%S A216955 2,2,2,4,2,2,6,6,2,2,12,12,4,2,2,20,26,10,4,2,2,40,52,20,8,4,2,2,74,
%T A216955 110,38,18,8,4,2,2,148,214,82,36,16,8,4,2,2,286,438,164,70,34,16,8,4,
%U A216955 2,2,572,876,328,140,68,32,16,8,4,2,2,1124,1762,660,286,134,66,32,16,8,4,2,2,2248,3524,1320,572,268,132,64,32,16,8,4,2,2
%N A216955 Triangle read by rows: T(n,k) (n>=1, 1<=k<=n) = number of binary sequences of length n and curling number k.
%C A216955 For definition of curling number see A216730.
%C A216955 "Binary" sequence means two-valued. It doesn't matter if the alphabet is {0,1} or {2,3}.
%C A216955 It appears that reversed rows converge to the sequence formed by the even terms of A090129. - _Omar E. Pol_, Nov 20 2012
%H A216955 N. J. A. Sloane, <a href="/A216955/b216955.txt">Table of n, a(n) for n = 1..5460</a>
%H A216955 Benjamin Chaffin, John P. Linderman, N. J. A. Sloane and Allan Wilks, <a href="/A216955/a216955.txt">First 104 rows of A216955</a>
%H A216955 B. Chaffin, J. P. Linderman, N. J. A. Sloane and Allan Wilks, <a href="http://arxiv.org/abs/1212.6102">On Curling Numbers of Integer Sequences</a>, arXiv:1212.6102, Dec 25 2012.
%H A216955 B. Chaffin, J. P. Linderman, N. J. A. Sloane and Allan Wilks, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL16/Sloane/sloane3.html">On Curling Numbers of Integer Sequences</a>, Journal of Integer Sequences, Vol. 16 (2013), Article 13.4.3.
%H A216955 <a href="/index/Cu#curling_numbers">Index entries for sequences related to curling numbers</a>
%e A216955 Triangle begins:
%e A216955 2,
%e A216955 2, 2,
%e A216955 4, 2, 2,
%e A216955 6, 6, 2, 2,
%e A216955 12, 12, 4, 2, 2,
%e A216955 20, 26, 10, 4, 2, 2,
%e A216955 40, 52, 20, 8, 4, 2, 2,
%e A216955 74, 110, 38, 18, 8, 4, 2, 2,
%e A216955 148, 214, 82, 36, 16, 8, 4, 2, 2,
%e A216955 286, 438, 164, 70, 34, 16, 8, 4, 2, 2,
%e A216955 ...
%Y A216955 Leading columns are A122536 (or A093371), A217211, A217212. Cf. A216956, A217943.
%K A216955 nonn,tabl
%O A216955 1,1
%A A216955 _N. J. A. Sloane_, Sep 26 2012
%E A216955 Extended to 104 rows by _N. J. A. Sloane_, Nov 15 2012