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 A236628 #14 Apr 28 2016 11:32:23 %S A236628 2,2,4,2,6,4,12,2,6,4,14,4,6,4,26 %N A236628 Triangle read by rows in which T(n,k) is the number of parts in the k-th region of the set of overcompositions of n, with overcompositions in colexicographic order. %C A236628 Right border gives A236002, n >= 1. %C A236628 Row sums give A236625, n >= 1. %e A236628 Written as an irregular triangle in which row n has length 2^n the sequence begins: %e A236628 2; %e A236628 2, 4; %e A236628 2, 6, 4, 12; %e A236628 2, 6, 4, 14, 4, 6, 4, 26; %e A236628 ... %e A236628 For n = 3 the diagram shows the four regions of the overcompositions of 3, with overcompositions in colexicographic order. %e A236628 ------------------------------------------------ %e A236628 . Diagram of Regions of the diagram %e A236628 overcompositions ------------------------ %e A236628 . of 3 k: 1 2 3 4 %e A236628 ------------------------------------------------ %e A236628 . _ _ _ _ _ _ %e A236628 1 |.| | | |.| | | | | %e A236628 2 |_| | | |_| _| | | | %e A236628 3 | .|.| | .| |.| %e A236628 4 | |.| | | |.| %e A236628 5 | .| | | .| | | %e A236628 6 |_ _| | |_ _| _ _| | %e A236628 7 |.| .| |.| | .| %e A236628 8 | | .| | | | .| %e A236628 9 |.| | |.| | | %e A236628 10 |_| | |_| _| | %e A236628 11 | .| | .| %e A236628 12 |_ _ _| |_ _ _| %e A236628 ... %e A236628 Number of parts.........: 2 6 4 12 %e A236628 . %e A236628 Every row of every region contains only one part. %Y A236628 Cf. A236002, A236625, A236626. %K A236628 nonn,tabf,more %O A236628 1,1 %A A236628 _Omar E. Pol_, Feb 01 2014