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.

A247023 Riordan array (1/(1-2*x), x*C(x)) where C(x) is the o.g.f. of Catalan numbers A000108.

Table of values

n a(n)
0 1
1 2
2 1
3 4
4 3
5 1
6 8
7 8
8 4
9 1
10 16
11 21
12 13
13 5
14 1
15 32
16 56
17 40
18 19
19 6
20 1
21 64
22 154
23 122
24 66
25 26
26 7
27 1
28 128
29 440
30 376
31 222
32 100
33 34
34 8
35 1
36 256
37 1309
38 1181
39 741
40 365
41 143
42 43
43 9
44 1
45 512
46 4048
47 3792
48 2483
49 1302
50 561
51 196
52 53
53 10
54 1
55 1024
56 12958
57 12446
58 8398
59 4606

List of values

[1, 2, 1, 4, 3, 1, 8, 8, 4, 1, 16, 21, 13, 5, 1, 32, 56, 40, 19, 6, 1, 64, 154, 122, 66, 26, 7, 1, 128, 440, 376, 222, 100, 34, 8, 1, 256, 1309, 1181, 741, 365, 143, 43, 9, 1, 512, 4048, 3792, 2483, 1302, 561, 196, 53, 10, 1, 1024, 12958, 12446, 8398, 4606]