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.

A281942 Nonnegative numbers whose digits can be formed by typing adjacent keys on a 123-456-789-0XX 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 85
32 87
33 89
34 96
35 98
36 123
37 125
38 145
39 147
40 214
41 236
42 254
43 256
44 258
45 321
46 325
47 365
48 369
49 412
50 452
51 456
52 458
53 470
54 478
55 521
56 523
57 541
58 547
59 563
60 569
61 587
62 589
63 632
64 652
65 654
66 658
67 698
68 741

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, 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, 587, 589, 632, 652, 654, 658, 698, 741]