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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.

A013616 Triangle of coefficients in expansion of (1+9x)^n.

Table of values

n a(n)
0 1
1 1
2 9
3 1
4 18
5 81
6 1
7 27
8 243
9 729
10 1
11 36
12 486
13 2916
14 6561
15 1
16 45
17 810
18 7290
19 32805
20 59049
21 1
22 54
23 1215
24 14580
25 98415
26 354294
27 531441
28 1
29 63
30 1701
31 25515
32 229635
33 1240029
34 3720087
35 4782969
36 1
37 72
38 2268
39 40824
40 459270
41 3306744
42 14880348
43 38263752
44 43046721

List of values

[1, 1, 9, 1, 18, 81, 1, 27, 243, 729, 1, 36, 486, 2916, 6561, 1, 45, 810, 7290, 32805, 59049, 1, 54, 1215, 14580, 98415, 354294, 531441, 1, 63, 1701, 25515, 229635, 1240029, 3720087, 4782969, 1, 72, 2268, 40824, 459270, 3306744, 14880348, 38263752, 43046721]