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A147906 as a simple table

na(n)
11
22
36
424
596
6444
72508
813216
974772
10490758
113587634
1232230992
13247788878
142035600526
1518463836692
16192838249056

[1,2,6,24,96,444,2508,13216,74772,490758,3587634,
 32230992,247788878,2035600526,18463836692,
 192838249056]