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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.

A128888 Table with g.f. [1-x*n-sqrt(x^2*n^2-2*n*x+1+4*x^2-4*x)]/(2*x).

Table of values

n a(n)
0 1
1 1
2 0
3 1
4 1
5 0
6 1
7 2
8 3
9 0
10 1
11 3
12 8
13 10
14 0
15 1
16 4
17 15
18 36
19 36
20 0
21 1
22 5
23 24
24 84
25 176
26 137
27 0
28 1
29 6
30 35
31 160
32 510
33 912
34 543
35 0
36 1
37 7
38 48
39 270
40 1152
41 3279
42 4928
43 2219
44 0
45 1
46 8
47 63
48 420
49 2240
50 8768
51 21975
52 27472
53 9285
54 0
55 1
56 9
57 80
58 616
59 3936
60 19605
61 69504
62 151905
63 156864

List of values

[1, 1, 0, 1, 1, 0, 1, 2, 3, 0, 1, 3, 8, 10, 0, 1, 4, 15, 36, 36, 0, 1, 5, 24, 84, 176, 137, 0, 1, 6, 35, 160, 510, 912, 543, 0, 1, 7, 48, 270, 1152, 3279, 4928, 2219, 0, 1, 8, 63, 420, 2240, 8768, 21975, 27472, 9285, 0, 1, 9, 80, 616, 3936, 19605, 69504, 151905, 156864]

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

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