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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.

A264460 Number of permutations of [n] with exactly one occurrence of the generalized pattern 23-1.

Table of values

n a(n)
3 1
4 6
5 32
6 171
7 944
8 5444
9 32919
10 208816
11 1388240
12 9657929
13 70187054
14 531857288
15 4194927585
16 34379859346
17 292303350268
18 2574284790795
19 23450837821836
20 220681535036288
21 2142618638738279
22 21438586249394500
23 220827871704427308
24 2339281577294955745

List of values

[1, 6, 32, 171, 944, 5444, 32919, 208816, 1388240, 9657929, 70187054, 531857288, 4194927585, 34379859346, 292303350268, 2574284790795, 23450837821836, 220681535036288, 2142618638738279, 21438586249394500, 220827871704427308, 2339281577294955745]

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

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