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A200318 as a simple table

n a(n)
1 1
2 1
3 3
4 16
5 120
6 1156
7 13608
8 189316
9 3039060
10 55291336
11 1124309208
12 25268818576
13 622008616320
14 16642670404816
15 480923246983728
16 14926731083999296
17 495243684302520000
18 17491488288340789696
19 655224017429959987968
20 25947019896579324410176
21 1083050878686674070676800

[1,1,3,16,120,1156,13608,189316,3039060,55291336,
 1124309208,25268818576,622008616320,
 16642670404816,480923246983728,14926731083999296,
 495243684302520000,17491488288340789696,
 655224017429959987968,25947019896579324410176,
 1083050878686674070676800]

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Last modified July 30 13:53 EDT 2024. Contains 374743 sequences. (Running on oeis4.)