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A181541 as a simple table

n a(n)
0 1
1 1
2 2
3 12
4 54
5 390
6 3120
7 28140
8 290640
9 3354960
10 42561120
11 586259520
12 8806422240
13 141680579040
14 2446025662080
15 44990666360640
16 877867974023040
17 18115179826423680
18 394351821275892480
19 9019730566889602560

[1,1,2,12,54,390,3120,28140,290640,3354960,
 42561120,586259520,8806422240,141680579040,
 2446025662080,44990666360640,877867974023040,
 18115179826423680,394351821275892480,
 9019730566889602560]

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Last modified February 24 04:02 EST 2024. Contains 370288 sequences. (Running on oeis4.)