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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.

A228218 T(n,k)=Number of second differences of arrays of length n+2 of numbers in 0..k.

Table of values

n a(n)
1 5
2 9
3 15
4 13
5 49
6 31
7 17
8 103
9 199
10 63
11 21
12 177
13 625
14 665
15 127
16 25
17 271
18 1429
19 3151
20 2059
21 255
22 29
23 385
24 2731
25 9705
26 14053
27 6305
28 511
29 33
30 519
31 4651
32 23351
33 58141
34 58975
35 19171
36 1023
37 37
38 673
39 7309
40 47953
41 176851
42 320481
43 242461
44 58025
45 2047
46 41
47 847
48 10825

List of values

[5, 9, 15, 13, 49, 31, 17, 103, 199, 63, 21, 177, 625, 665, 127, 25, 271, 1429, 3151, 2059, 255, 29, 385, 2731, 9705, 14053, 6305, 511, 33, 519, 4651, 23351, 58141, 58975, 19171, 1023, 37, 673, 7309, 47953, 176851, 320481, 242461, 58025, 2047, 41, 847, 10825]