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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.

A121576 Riordan array (2-2*x-sqrt(1-8*x+4*x^2), (1-2*x-sqrt(1-8*x+4*x^2))/2).

Table of values

n a(n)
0 1
1 2
2 1
3 6
4 5
5 1
6 24
7 24
8 8
9 1
10 114
11 123
12 51
13 11
14 1
15 600
16 672
17 312
18 87
19 14
20 1
21 3372
22 3858
23 1914
24 618
25 132
26 17
27 1
28 19824
29 22992
30 11904
31 4218
32 1068
33 186
34 20
35 1
36 120426
37 140991
38 75183
39 28383
40 8043
41 1689
42 249
43 23
44 1
45 749976
46 884112
47 481704
48 190347
49 58398
50 13929
51 2508
52 321
53 26
54 1

List of values

[1, 2, 1, 6, 5, 1, 24, 24, 8, 1, 114, 123, 51, 11, 1, 600, 672, 312, 87, 14, 1, 3372, 3858, 1914, 618, 132, 17, 1, 19824, 22992, 11904, 4218, 1068, 186, 20, 1, 120426, 140991, 75183, 28383, 8043, 1689, 249, 23, 1, 749976, 884112, 481704, 190347, 58398, 13929, 2508, 321, 26, 1]

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

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