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.

A280595 Nonnegative numbers whose digits can be formed by typing adjacent keys on a 123-456-789-00X keypad without repeating a digit.

Table of values

n a(n)
1 0
2 1
3 2
4 3
5 4
6 5
7 6
8 7
9 8
10 9
11 12
12 14
13 21
14 23
15 25
16 32
17 36
18 41
19 45
20 47
21 52
22 54
23 56
24 58
25 63
26 65
27 69
28 70
29 74
30 78
31 80
32 85
33 87
34 89
35 96
36 98
37 123
38 125
39 145
40 147
41 214
42 236
43 254
44 256
45 258
46 321
47 325
48 365
49 369
50 412
51 452
52 456
53 458
54 470
55 478
56 521
57 523
58 541
59 547
60 563
61 569
62 580
63 587
64 589
65 632
66 652
67 654
68 658

List of values

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 14, 21, 23, 25, 32, 36, 41, 45, 47, 52, 54, 56, 58, 63, 65, 69, 70, 74, 78, 80, 85, 87, 89, 96, 98, 123, 125, 145, 147, 214, 236, 254, 256, 258, 321, 325, 365, 369, 412, 452, 456, 458, 470, 478, 521, 523, 541, 547, 563, 569, 580, 587, 589, 632, 652, 654, 658]