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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.

A134562 Array T by antidiagonals: T(n,k) = k-th number whose formal base-3 representation has exactly n terms. ("Formal" means that all the nonzero coefficients are 1's.).

Table of values

n a(n)
1 1
2 3
3 2
4 9
5 4
6 5
7 27
8 6
9 7
10 8
11 81
12 10
13 11
14 14
15 17
16 243
17 12
18 13
19 16
20 23
21 26
22 729
23 18
24 15
25 20
26 25
27 44
28 53
29 2187
30 28
31 19
32 22
33 35
34 50
35 71

List of values

[1, 3, 2, 9, 4, 5, 27, 6, 7, 8, 81, 10, 11, 14, 17, 243, 12, 13, 16, 23, 26, 729, 18, 15, 20, 25, 44, 53, 2187, 28, 19, 22, 35, 50, 71]