cp's OEIS Frontend

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.

A117895 Triangle T(n, k) = (k-n)*A000129(k+1) + (3*n-3*k+1)*A000129(k) with T(n,0) = 1, for 0 <= k <= n-1, read by rows.

Table of values

n a(n)
0 1
1 1
2 2
3 1
4 3
5 3
6 1
7 4
8 4
9 8
10 1
11 5
12 5
13 11
14 19
15 1
16 6
17 6
18 14
19 26
20 46
21 1
22 7
23 7
24 17
25 33
26 63
27 111
28 1
29 8
30 8
31 20
32 40
33 80
34 152
35 268
36 1
37 9
38 9
39 23
40 47
41 97
42 193
43 367
44 647
45 1
46 10
47 10
48 26
49 54
50 114
51 234
52 466
53 886
54 1562
55 1
56 11
57 11
58 29
59 61
60 131
61 275
62 565
63 1125
64 2139
65 3771
66 1
67 12
68 12
69 32
70 68
71 148
72 316
73 664
74 1364
75 2716
76 5164
77 9104

List of values

[1, 1, 2, 1, 3, 3, 1, 4, 4, 8, 1, 5, 5, 11, 19, 1, 6, 6, 14, 26, 46, 1, 7, 7, 17, 33, 63, 111, 1, 8, 8, 20, 40, 80, 152, 268, 1, 9, 9, 23, 47, 97, 193, 367, 647, 1, 10, 10, 26, 54, 114, 234, 466, 886, 1562, 1, 11, 11, 29, 61, 131, 275, 565, 1125, 2139, 3771, 1, 12, 12, 32, 68, 148, 316, 664, 1364, 2716, 5164, 9104]