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.

A224992 Non-crossing, non-nesting, 3-colored permutations on {1,2,...,n}.

Table of values

n a(n)
0 1
1 3
2 18
3 144
4 1368
5 14400
6 160992
7 1861632
8 21919104
9 260508672
10 3110985216
11 37241118720
12 446349219840
13 5352925446144
14 64215514275840
15 770468624990208
16 9244918222258176
17 110934787001942016
18 1331192054033547264
19 15974152308466384896
20 191688913661984243712

List of values

[1, 3, 18, 144, 1368, 14400, 160992, 1861632, 21919104, 260508672, 3110985216, 37241118720, 446349219840, 5352925446144, 64215514275840, 770468624990208, 9244918222258176, 110934787001942016, 1331192054033547264, 15974152308466384896, 191688913661984243712]

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

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