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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.

A111527 Inverse of A111526. Row sums have general term C(n,floor(n/2))*(cos(Pi*n/2) + sin(Pi*n/2)).

Table of values

n a(n)
0 1
1 0
2 1
3 -3
4 0
5 1
6 0
7 -4
8 0
9 1
10 10
11 0
12 -5
13 0
14 1
15 0
16 15
17 0
18 -6
19 0
20 1
21 -35
22 0
23 21
24 0
25 -7
26 0
27 1
28 0
29 -56
30 0
31 28
32 0
33 -8
34 0
35 1
36 126
37 0
38 -84
39 0
40 36
41 0
42 -9
43 0
44 1
45 0
46 210
47 0
48 -120
49 0
50 45
51 0
52 -10
53 0
54 1
55 -462
56 0
57 330
58 0
59 -165
60 0
61 55
62 0
63 -11
64 0
65 1
66 0
67 -792
68 0
69 495
70 0
71 -220
72 0
73 66
74 0
75 -12
76 0
77 1
78 1716
79 0
80 -1287
81 0
82 715
83 0
84 -286
85 0
86 78
87 0
88 -13
89 0
90 1

List of values

[1, 0, 1, -3, 0, 1, 0, -4, 0, 1, 10, 0, -5, 0, 1, 0, 15, 0, -6, 0, 1, -35, 0, 21, 0, -7, 0, 1, 0, -56, 0, 28, 0, -8, 0, 1, 126, 0, -84, 0, 36, 0, -9, 0, 1, 0, 210, 0, -120, 0, 45, 0, -10, 0, 1, -462, 0, 330, 0, -165, 0, 55, 0, -11, 0, 1, 0, -792, 0, 495, 0, -220, 0, 66, 0, -12, 0, 1, 1716, 0, -1287, 0, 715, 0, -286, 0, 78, 0, -13, 0, 1]

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