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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.

A089849 Number of fixed points in range [A014137(n-1)..A014138(n-1)] of permutation A069772.

Table of values

n a(n)
0 1
1 1
2 2
3 1
4 6
5 2
6 20
7 5
8 70
9 14
10 252
11 42
12 924
13 132
14 3432
15 429
16 12870
17 1430
18 48620
19 4862
20 184756
21 16796
22 705432
23 58786
24 2704156
25 208012
26 10400600
27 742900
28 40116600
29 2674440
30 155117520
31 9694845
32 601080390
33 35357670
34 2333606220
35 129644790

List of values

[1, 1, 2, 1, 6, 2, 20, 5, 70, 14, 252, 42, 924, 132, 3432, 429, 12870, 1430, 48620, 4862, 184756, 16796, 705432, 58786, 2704156, 208012, 10400600, 742900, 40116600, 2674440, 155117520, 9694845, 601080390, 35357670, 2333606220, 129644790]

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

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