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 A282905 #4 Feb 24 2017 17:57:05
%S A282905 1,1,2,3,1,2,3,3,4,5,6,1,2,3,4,3,4,5,5,6,7,6,7,8,9,10,1,2,3,4,5,3,4,5,
%T A282905 6,5,6,7,7,8,9,6,7,8,8,9,10,9,10,11,12,10,11,12,13,14,15,1,2,3,4,5,6,
%U A282905 3,4,5,6,7,5,6,7,8,7,8,9,9,10,11,6,7,8,9,8
%N A282905 Concatenation of the sums of elements of P{1}, P{1, 2}, P{1, 2, 3}, ..., P{1, 2, 3, ..., n}; where P{A} denote the power set of set A ordered by the size of the subsets, and in each subset, following the increasing order.
%e A282905 Rows with power sets of set of numbers from 1 to n (without nonempty sets):
%e A282905 {1};
%e A282905 {1}, {2}, {1, 2};
%e A282905 {1}, {2}, {3}, {1, 2}, {1, 3}, {2, 3}, {1, 2, 3};
%e A282905 ...
%e A282905 Rows with the sum of elements of these subsets:
%e A282905 1;
%e A282905 1, 2, 3;
%e A282905 1, 2, 3, 3, 4, 5, 6;
%e A282905 ...
%e A282905 Concatenation: 1, 1, 2, 3, 1, 2, 3, 3, 4, 5, 6, ...
%Y A282905 Cf. A193360, A282904, A221914.
%K A282905 nonn
%O A282905 1,3
%A A282905 _Jaroslav Krizek_, Feb 24 2017