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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.

A179257 Number of permutations of length n which avoid the patterns 321 and 1324.

Table of values

n a(n)
0 1
1 1
2 2
3 5
4 13
5 32
6 72
7 148
8 281
9 499
10 838
11 1343
12 2069
13 3082
14 4460
15 6294
16 8689
17 11765
18 15658
19 20521
20 26525
21 33860
22 42736
23 53384
24 66057
25 81031
26 98606
27 119107
28 142885
29 170318
30 201812
31 237802
32 278753
33 325161
34 377554
35 436493
36 502573
37 576424
38 658712
39 750140
40 851449

List of values

[1, 1, 2, 5, 13, 32, 72, 148, 281, 499, 838, 1343, 2069, 3082, 4460, 6294, 8689, 11765, 15658, 20521, 26525, 33860, 42736, 53384, 66057, 81031, 98606, 119107, 142885, 170318, 201812, 237802, 278753, 325161, 377554, 436493, 502573, 576424, 658712, 750140, 851449]

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

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