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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.

A230832 Number of permutations of [n] with exactly one occurrence of the consecutive step pattern up, down, up, down.

Table of values

n a(n)
0 0
1 0
2 0
3 0
4 0
5 16
6 192
7 1472
8 12800
9 132352
10 1366016
11 14781952
12 178102272
13 2282645504
14 30639611904
15 440041603072
16 6720063012864
17 107722700685312
18 1818098902499328
19 32319047553515520
20 601556224722337792
21 11702621573275975680
22 237913839294912397312

List of values

[0, 0, 0, 0, 0, 16, 192, 1472, 12800, 132352, 1366016, 14781952, 178102272, 2282645504, 30639611904, 440041603072, 6720063012864, 107722700685312, 1818098902499328, 32319047553515520, 601556224722337792, 11702621573275975680, 237913839294912397312]

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

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