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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.

A344445 Number of cycle-up-down permutations of [2n] having n cycles.

Table of values

n a(n)
0 1
1 1
2 7
3 105
4 2345
5 69405
6 2559667
7 113073961
8 5820788545
9 342176336073
10 22616620648895
11 1660292619682697
12 134029227728536985
13 11800452870718122325
14 1125324001129006580475
15 115551341953019187183225
16 12711056625162235880359425
17 1491325482312555276046069905

List of values

[1, 1, 7, 105, 2345, 69405, 2559667, 113073961, 5820788545, 342176336073, 22616620648895, 1660292619682697, 134029227728536985, 11800452870718122325, 1125324001129006580475, 115551341953019187183225, 12711056625162235880359425, 1491325482312555276046069905]

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

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