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.

A376530 G.f. A(x) = (1/3) * Sum_{n>=0} Product_{k=0..2*n} (x^k + x^n + x^(2*n-k)).

Table of values

n a(n)
0 1
1 1
2 2
3 3
4 3
5 3
6 5
7 6
8 10
9 11
10 15
11 15
12 18
13 20
14 25
15 30
16 38
17 47
18 57
19 67
20 78
21 89
22 100
23 111
24 128
25 144
26 168
27 191
28 227
29 260
30 305
31 347
32 403
33 451
34 514
35 571
36 644
37 710
38 795
39 881
40 989
41 1099
42 1237
43 1384
44 1559
45 1746
46 1963
47 2196
48 2457
49 2733
50 3044
51 3369
52 3729
53 4107
54 4529
55 4975
56 5473
57 6003
58 6605
59 7243
60 7973

List of values

[1, 1, 2, 3, 3, 3, 5, 6, 10, 11, 15, 15, 18, 20, 25, 30, 38, 47, 57, 67, 78, 89, 100, 111, 128, 144, 168, 191, 227, 260, 305, 347, 403, 451, 514, 571, 644, 710, 795, 881, 989, 1099, 1237, 1384, 1559, 1746, 1963, 2196, 2457, 2733, 3044, 3369, 3729, 4107, 4529, 4975, 5473, 6003, 6605, 7243, 7973]