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A224788 as a simple table

n a(n)
0 1
1 1
2 3
3 18
4 168
5 2142
6 34704
7 682740
8 15810372
9 421339176
10 12702393792
11 427435993512
12 15881634963216
13 645804320863680
14 28527455317884336
15 1360332028008819360
16 69645942884911181184
17 3810436222004101378656
18 221867131720533800409216
19 13698420738298341356760768

[1,1,3,18,168,2142,34704,682740,15810372,
 421339176,12702393792,427435993512,15881634963216,
 645804320863680,28527455317884336,
 1360332028008819360,69645942884911181184,
 3810436222004101378656,221867131720533800409216,
 13698420738298341356760768]

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Last modified July 16 09:13 EDT 2020. Contains 335784 sequences. (Running on oeis4.)