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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.

A110519 Riordan array (1/(1-x*c(3*x)), x*c(3*x)/(1-x*c(3*x))), c(x) the g.f. of A000108.

Table of values

n a(n)
0 1
1 1
2 1
3 4
4 5
5 1
6 25
7 33
8 9
9 1
10 190
11 256
12 78
13 13
14 1
15 1606
16 2186
17 703
18 139
19 17
20 1
21 14506
22 19863
23 6591
24 1430
25 216
26 21
27 1
28 137089
29 188449
30 63813
31 14669
32 2501
33 309
34 25
35 1
36 1338790
37 1845416
38 633808
39 151532
40 27940
41 3980
42 418
43 29
44 1
45 13403950
46 18513822
47 6425196
48 1580316
49 307752
50 48180
51 5931
52 543
53 33
54 1

List of values

[1, 1, 1, 4, 5, 1, 25, 33, 9, 1, 190, 256, 78, 13, 1, 1606, 2186, 703, 139, 17, 1, 14506, 19863, 6591, 1430, 216, 21, 1, 137089, 188449, 63813, 14669, 2501, 309, 25, 1, 1338790, 1845416, 633808, 151532, 27940, 3980, 418, 29, 1, 13403950, 18513822, 6425196, 1580316, 307752, 48180, 5931, 543, 33, 1]

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

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