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A180589 as a simple table

n a(n)
1 1
2 1
3 3
4 12
5 54
6 294
7 1866
8 13698
9 114064
10 1062864
11 10958530
12 123870240
13 1523289156
14 20247546240
15 289277533440
16 4420892649600
17 71965034739952
18 1243166003251200
19 22713955095665178
20 437647401838080000 

[1,1,3,12,54,294,1866,13698,114064,1062864,
 10958530,123870240,1523289156,20247546240,
 289277533440,4420892649600,71965034739952,
 1243166003251200,22713955095665178,
 437647401838080000]

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Last modified April 18 21:51 EDT 2024. Contains 371781 sequences. (Running on oeis4.)