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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.

A177481 Number of permutations of order n avoiding the consecutive pattern efgh with e and g

Table of values

n a(n)
0 1
1 1
2 2
3 6
4 20
5 80
6 404
7 2368
8 15488
9 114480
10 948992
11 8625672
12 85223792
13 913869056
14 10567326528
15 130796711016
16 1726077013456
17 24213357455936
18 359694651093152
19 5638959807231240
20 93052021458248400
21 1612444736747193696
22 29271726199933801536
23 555518182602741687432
24 11001032351303890637648

List of values

[1, 1, 2, 6, 20, 80, 404, 2368, 15488, 114480, 948992, 8625672, 85223792, 913869056, 10567326528, 130796711016, 1726077013456, 24213357455936, 359694651093152, 5638959807231240, 93052021458248400, 1612444736747193696, 29271726199933801536, 555518182602741687432, 11001032351303890637648]

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

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