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A152345 as a simple table

na(n)
11
22
36
424
5120
6608
73684
826640
9192228
101659048
1114739946
12146975590
131544407392
1417545685816
15223201723716
162939542170692

[1,2,6,24,120,608,3684,26640,192228,1659048,
 14739946,146975590,1544407392,17545685816,
 223201723716,2939542170692]