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.

A177276 Triangle T(n,k) with the coefficient [x^k] of the polynomial (1+x^2)^n + 2*n*x*(1+x^2)^(n-1) in row n, column k, 0<=k<=2n.

Table of values

n a(n)
0 1
1 1
2 2
3 1
4 1
5 4
6 2
7 4
8 1
9 1
10 6
11 3
12 12
13 3
14 6
15 1
16 1
17 8
18 4
19 24
20 6
21 24
22 4
23 8
24 1
25 1
26 10
27 5
28 40
29 10
30 60
31 10
32 40
33 5
34 10
35 1
36 1
37 12
38 6
39 60
40 15
41 120
42 20
43 120
44 15
45 60
46 6
47 12
48 1
49 1
50 14
51 7
52 84
53 21
54 210
55 35
56 280
57 35
58 210
59 21
60 84
61 7
62 14
63 1
64 1
65 16
66 8
67 112
68 28
69 336
70 56
71 560
72 70
73 560
74 56
75 336
76 28
77 112

List of values

[1, 1, 2, 1, 1, 4, 2, 4, 1, 1, 6, 3, 12, 3, 6, 1, 1, 8, 4, 24, 6, 24, 4, 8, 1, 1, 10, 5, 40, 10, 60, 10, 40, 5, 10, 1, 1, 12, 6, 60, 15, 120, 20, 120, 15, 60, 6, 12, 1, 1, 14, 7, 84, 21, 210, 35, 280, 35, 210, 21, 84, 7, 14, 1, 1, 16, 8, 112, 28, 336, 56, 560, 70, 560, 56, 336, 28, 112]