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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.

A370233 Triangle read by rows. T(n, k) = (n - k + 1) * binomial(n + k + 1, 2*k)^2 / (n + k + 1).

Table of values

n a(n)
0 1
1 1
2 3
3 1
4 18
5 5
6 1
7 60
8 75
9 7
10 1
11 150
12 525
13 196
14 9
15 1
16 315
17 2450
18 2352
19 405
20 11
21 1
22 588
23 8820
24 17640
25 7425
26 726
27 13
28 1
29 1008
30 26460
31 97020
32 81675
33 18876
34 1183
35 15
36 1
37 1620
38 69300
39 426888
40 637065
41 286286
42 41405
43 1800
44 17
45 1
46 2475
47 163350
48 1585584
49 3864861
50 3006003
51 828100
52 81600
53 2601
54 19

List of values

[1, 1, 3, 1, 18, 5, 1, 60, 75, 7, 1, 150, 525, 196, 9, 1, 315, 2450, 2352, 405, 11, 1, 588, 8820, 17640, 7425, 726, 13, 1, 1008, 26460, 97020, 81675, 18876, 1183, 15, 1, 1620, 69300, 426888, 637065, 286286, 41405, 1800, 17, 1, 2475, 163350, 1585584, 3864861, 3006003, 828100, 81600, 2601, 19]