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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.

A138187 Hankel transform of binomial(2*n+3, n).

Table of values

n a(n)
0 1
1 -4
2 3
3 3
4 -8
5 5
6 5
7 -12
8 7
9 7
10 -16
11 9
12 9
13 -20
14 11
15 11
16 -24
17 13
18 13
19 -28
20 15
21 15
22 -32
23 17
24 17
25 -36
26 19
27 19
28 -40
29 21
30 21
31 -44
32 23
33 23
34 -48
35 25
36 25
37 -52
38 27
39 27
40 -56
41 29
42 29
43 -60
44 31
45 31
46 -64
47 33
48 33
49 -68
50 35
51 35
52 -72
53 37
54 37
55 -76
56 39
57 39
58 -80
59 41

List of values

[1, -4, 3, 3, -8, 5, 5, -12, 7, 7, -16, 9, 9, -20, 11, 11, -24, 13, 13, -28, 15, 15, -32, 17, 17, -36, 19, 19, -40, 21, 21, -44, 23, 23, -48, 25, 25, -52, 27, 27, -56, 29, 29, -60, 31, 31, -64, 33, 33, -68, 35, 35, -72, 37, 37, -76, 39, 39, -80, 41]