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A180111 as a simple table

n a(n)
1 1
2 1
3 3
4 13
5 63
6 360
7 2612
8 20628
9 184784
10 1814400
11 20168640
12 241650132
13 3135712971
14 43589145600
15 657203494738
16 10507402233956
17 178516252664449
18 3201186852864000
19 60997137390971895
20 1219540642469803416
21 25602927723893352601
22 562000363888803840000

[1,1,3,13,63,360,2612,20628,184784,1814400,
 20168640,241650132,3135712971,43589145600,
 657203494738,10507402233956,178516252664449,
 3201186852864000,60997137390971895,
 1219540642469803416,25602927723893352601,
 562000363888803840000]

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Last modified March 29 08:08 EDT 2024. Contains 371265 sequences. (Running on oeis4.)