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A207783 as a simple table

n a(n)
1 18
2 324
3 1326
4 5241
5 17763
6 65094
7 246087
8 887406
9 3238750
10 11948552
11 43643883
12 159571382
13 585152040
14 2141835490
15 7838632143
16 28707385058
17 105103321375
18 384772465146
19 1408810317447
20 5157976273501
21 18884160177390
22 69139905612647

[18,324,1326,5241,17763,65094,246087,887406,
 3238750,11948552,43643883,159571382,585152040,
 2141835490,7838632143,28707385058,105103321375,
 384772465146,1408810317447,5157976273501,
 18884160177390,69139905612647]

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Last modified August 15 23:32 EDT 2022. Contains 356150 sequences. (Running on oeis4.)