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.

A280594 Nonnegative numbers whose digits can be formed by typing adjacent keys on a 123-456-789-X0X 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 74
29 78
30 80
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
53 478
54 521
55 523
56 541
57 547
58 563
59 569
60 580
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, 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, 478, 521, 523, 541, 547, 563, 569, 580, 587, 589, 632, 652, 654, 658, 698, 741]