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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.

A225965 Number of permutations of [n] having exactly 4 strong fixed blocks.

Table of values

n a(n)
10 1
11 13
12 117
13 928
14 7125
15 55527
16 451472
17 3896347
18 36098855
19 361638248
20 3932908263
21 46483325765
22 596325240445
23 8278698772954
24 123863754811374
25 1988038987565688
26 34070987657660446
27 620747700139873322
28 11975106447284305656
29 243741719070454243530

List of values

[1, 13, 117, 928, 7125, 55527, 451472, 3896347, 36098855, 361638248, 3932908263, 46483325765, 596325240445, 8278698772954, 123863754811374, 1988038987565688, 34070987657660446, 620747700139873322, 11975106447284305656, 243741719070454243530]

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

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