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.

A117375 Riordan array (1/(1-3x*c(x)),xc(x)), c(x) the g.f. of A000108.

Table of values

n a(n)
0 1
1 3
2 1
3 12
4 4
5 1
6 51
7 17
8 5
9 1
10 222
11 74
12 23
13 6
14 1
15 978
16 326
17 104
18 30
19 7
20 1
21 4338
22 1446
23 468
24 142
25 38
26 8
27 1
28 19323
29 6441
30 2103
31 657
32 189
33 47
34 9
35 1
36 86310
37 28770
38 9447
39 3006
40 903
41 246
42 57
43 10
44 1
45 386250
46 128750
47 42440
48 13670
49 4223
50 1217
51 314
52 68
53 11
54 1
55 1730832

List of values

[1, 3, 1, 12, 4, 1, 51, 17, 5, 1, 222, 74, 23, 6, 1, 978, 326, 104, 30, 7, 1, 4338, 1446, 468, 142, 38, 8, 1, 19323, 6441, 2103, 657, 189, 47, 9, 1, 86310, 28770, 9447, 3006, 903, 246, 57, 10, 1, 386250, 128750, 42440, 13670, 4223, 1217, 314, 68, 11, 1, 1730832]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.