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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.

A296530 Number of non-averaging permutations of [n] with first element n.

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 2
5 2
6 5
7 10
8 28
9 24
10 50
11 124
12 283
13 528
14 1266
15 3715
16 10702
17 8740
18 15414
19 31988
20 68465
21 160964
22 380124
23 890738
24 2230219
25 3990852
26 8354276
27 20281732
28 46056920
29 131289988
30 349369117
31 1054037937
32 3081527146
33 2440225484
34 4201202020
35 7475926894
36 13276918426

List of values

[1, 1, 1, 1, 2, 2, 5, 10, 28, 24, 50, 124, 283, 528, 1266, 3715, 10702, 8740, 15414, 31988, 68465, 160964, 380124, 890738, 2230219, 3990852, 8354276, 20281732, 46056920, 131289988, 349369117, 1054037937, 3081527146, 2440225484, 4201202020, 7475926894, 13276918426]

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

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