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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.

A188808 T(n,k)=Number of nXk array permutations with each element remaining in its original row or its original column.

Table of values

n a(n)
1 1
2 2
3 2
4 6
5 9
6 6
7 24
8 82
9 82
10 24
11 120
12 1313
13 2720
14 1313
15 120
16 720
17 32826
18 194568
19 194568
20 32826
21 720
22 5040
23 1181737
24 26101232
25 72104097
26 26101232
27 1181737
28 5040
29 40320
30 57905114
31 5919004912
32 57951767544
33 57951767544
34 5919004912
35 57905114
36 40320

List of values

[1, 2, 2, 6, 9, 6, 24, 82, 82, 24, 120, 1313, 2720, 1313, 120, 720, 32826, 194568, 194568, 32826, 720, 5040, 1181737, 26101232, 72104097, 26101232, 1181737, 5040, 40320, 57905114, 5919004912, 57951767544, 57951767544, 5919004912, 57905114, 40320]

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

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