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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.

A006214 Number of down-up permutations of n+5 starting with n+1.

Table of values

n a(n)
0 0
1 5
2 32
3 178
4 1024
5 6320
6 42272
7 306448
8 2401024
9 20253440
10 183194912
11 1769901568
12 18198049024
13 198465167360
14 2288729963552
15 27831596812288
16 355961301697024
17 4777174607790080
18 67129052143388192
19 985743987073220608
20 15098811288386497024
21 240833888369219993600

List of values

[0, 5, 32, 178, 1024, 6320, 42272, 306448, 2401024, 20253440, 183194912, 1769901568, 18198049024, 198465167360, 2288729963552, 27831596812288, 355961301697024, 4777174607790080, 67129052143388192, 985743987073220608, 15098811288386497024, 240833888369219993600]

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

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