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A207486 as a simple table

n a(n)
1 18
2 324
3 1014
4 2749
5 8808
6 26980
7 89417
8 292136
9 996484
10 3383013
11 11790326
12 41028862
13 145231303
14 513949716
15 1839937674
16 6589246547
17 23788589214
18 85938464486
19 312245147469
20 1135416510570
21 4145850489950
22 15151086644931

[18,324,1014,2749,8808,26980,89417,292136,996484,
 3383013,11790326,41028862,145231303,513949716,
 1839937674,6589246547,23788589214,85938464486,
 312245147469,1135416510570,4145850489950,
 15151086644931]

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Last modified October 3 13:46 EDT 2023. Contains 365866 sequences. (Running on oeis4.)