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A147732 as a simple table

na(n)
11
22
36
424
5120
6624
74176
832620
9284384
102803702
1129664334
12339061272
134391825384
1458843870478
15866121264934

[1,2,6,24,120,624,4176,32620,284384,2803702,
 29664334,339061272,4391825384,58843870478,
 866121264934]