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.

A159965 Riordan array (1/sqrt(1-4x), (1-2x-(1-3x)c(x))/(x*sqrt(1-4x))), c(x) the g.f. of A000108.

Table of values

n a(n)
0 1
1 2
2 1
3 6
4 5
5 1
6 20
7 21
8 8
9 1
10 70
11 84
12 45
13 11
14 1
15 252
16 330
17 220
18 78
19 14
20 1
21 924
22 1287
23 1001
24 455
25 120
26 17
27 1
28 3432
29 5005
30 4368
31 2380
32 816
33 171
34 20
35 1
36 12870
37 19448
38 18564
39 11628
40 4845
41 1330
42 231
43 23
44 1
45 48620
46 75582
47 77520
48 54264
49 26334
50 8855
51 2024
52 300
53 26
54 1

List of values

[1, 2, 1, 6, 5, 1, 20, 21, 8, 1, 70, 84, 45, 11, 1, 252, 330, 220, 78, 14, 1, 924, 1287, 1001, 455, 120, 17, 1, 3432, 5005, 4368, 2380, 816, 171, 20, 1, 12870, 19448, 18564, 11628, 4845, 1330, 231, 23, 1, 48620, 75582, 77520, 54264, 26334, 8855, 2024, 300, 26, 1]

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

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