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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.

A355172 The Fuss-Catalan triangle of order 2, read by rows. Related to ternary trees.

Table of values

n a(n)
0 1
1 0
2 1
3 0
4 1
5 3
6 0
7 1
8 5
9 12
10 0
11 1
12 7
13 25
14 55
15 0
16 1
17 9
18 42
19 130
20 273
21 0
22 1
23 11
24 63
25 245
26 700
27 1428
28 0
29 1
30 13
31 88
32 408
33 1428
34 3876
35 7752
36 0
37 1
38 15
39 117
40 627
41 2565
42 8379
43 21945
44 43263
45 0
46 1
47 17
48 150
49 910
50 4235
51 15939
52 49588
53 126500
54 246675

List of values

[1, 0, 1, 0, 1, 3, 0, 1, 5, 12, 0, 1, 7, 25, 55, 0, 1, 9, 42, 130, 273, 0, 1, 11, 63, 245, 700, 1428, 0, 1, 13, 88, 408, 1428, 3876, 7752, 0, 1, 15, 117, 627, 2565, 8379, 21945, 43263, 0, 1, 17, 150, 910, 4235, 15939, 49588, 126500, 246675]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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