A066555 - OEIS

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A066555 as a simple table

n	a(n)
1	2
2	46
3	810
4	1214
5	16182
6	22242
7	6283032
8	34363840
9	424446485
10	525456586
11	6264666870
12	727476788082
13	8486889092949
14	69810010210410
15	610811011211411
16	6118120122124126
17	12813013213413613
18	814014214414614815

[2,46,810,1214,16182,22242,6283032,34363840, 424446485,525456586,6264666870,727476788082, 8486889092949,69810010210410,610811011211411, 6118120122124126,12813013213413613, 814014214414614815]