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.

A005284 Number of permutations of (1,...,n) having n-6 inversions (n>=6).

Table of values

n a(n)
6 1
7 6
8 27
9 111
10 440
11 1717
12 6655
13 25728
14 99412
15 384320
16 1487262
17 5762643
18 22357907
19 86859412
20 337879565
21 1315952428
22 5131231668
23 20029728894
24 78265410550
25 306109412100
26 1198306570554
27 4694809541046
28 18407850118383

List of values

[1, 6, 27, 111, 440, 1717, 6655, 25728, 99412, 384320, 1487262, 5762643, 22357907, 86859412, 337879565, 1315952428, 5131231668, 20029728894, 78265410550, 306109412100, 1198306570554, 4694809541046, 18407850118383]

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

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