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A299433 as a simple table

n a(n)
0 1
1 1
2 1
3 3
4 6
5 90
6 810
7 15120
8 68040
9 24494400
10 1020600
11 12933043200
12 9093546000
13 14122883174400
14 2482538058000
15 76263569141760000
16 59580913392000
17 15557768104919040000
18 14357510604637200000
19 28377369023372328960000
20 8183781044643204000000
21 3539793011975464314470400000
22 270064774473225732000000
23 13677760198273194111113625600000

[1,1,1,3,6,90,810,15120,68040,24494400,1020600,
 12933043200,9093546000,14122883174400,
 2482538058000,76263569141760000,59580913392000,
 15557768104919040000,14357510604637200000,
 28377369023372328960000,8183781044643204000000,
 3539793011975464314470400000,
 270064774473225732000000,
 13677760198273194111113625600000]

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Last modified March 29 10:44 EDT 2024. Contains 371268 sequences. (Running on oeis4.)