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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.

A378807 Decimal expansion of Sum_{k>=1} (-1)^k/binomial(4*k, k) (negated).

Table of values

n a(n)
0 2
1 1
2 8
3 3
4 3
5 9
6 5
7 4
8 7
9 1
10 7
11 7
12 9
13 3
14 4
15 4
16 3
17 6
18 8
19 7
20 0
21 9
22 9
23 8
24 3
25 2
26 1
27 0
28 2
29 7
30 8
31 8
32 5
33 3
34 9
35 1
36 9
37 8
38 3
39 0
40 4
41 8
42 6
43 4
44 0
45 2
46 9
47 2
48 2
49 6
50 2
51 2
52 7
53 0
54 0
55 1
56 3
57 2
58 5
59 6
60 8
61 5
62 4
63 9
64 8
65 0
66 6
67 6
68 7
69 9
70 6
71 6
72 1
73 3
74 5
75 9
76 0
77 4
78 2
79 7
80 6
81 1
82 3
83 1
84 7
85 0
86 9
87 3
88 7
89 4
90 0
91 2
92 9
93 0
94 7
95 9
96 6
97 3
98 9
99 3
100 9
101 6
102 3
103 3
104 2

List of values

[2, 1, 8, 3, 3, 9, 5, 4, 7, 1, 7, 7, 9, 3, 4, 4, 3, 6, 8, 7, 0, 9, 9, 8, 3, 2, 1, 0, 2, 7, 8, 8, 5, 3, 9, 1, 9, 8, 3, 0, 4, 8, 6, 4, 0, 2, 9, 2, 2, 6, 2, 2, 7, 0, 0, 1, 3, 2, 5, 6, 8, 5, 4, 9, 8, 0, 6, 6, 7, 9, 6, 6, 1, 3, 5, 9, 0, 4, 2, 7, 6, 1, 3, 1, 7, 0, 9, 3, 7, 4, 0, 2, 9, 0, 7, 9, 6, 3, 9, 3, 9, 6, 3, 3, 2]