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A082298 as a simple table

n a(n)
0 1
1 4
2 20
3 116
4 740
5 5028
6 35700
7 261780
8 1967300
9 15072836
10 117297620
11 924612532
12 7367204260
13 59240277988
14 480118631220
15 3917880562644
16 32163325863300
17 265446382860420
18 2201136740855700
19 18329850024033012
20 153225552507991140

[1,4,20,116,740,5028,35700,261780,1967300,
 15072836,117297620,924612532,7367204260,
 59240277988,480118631220,3917880562644,
 32163325863300,265446382860420,2201136740855700,
 18329850024033012,153225552507991140]

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Last modified April 18 16:22 EDT 2024. Contains 371780 sequences. (Running on oeis4.)