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A350268 as a simple table

na(n)
01
11
24
322
4168
51720
622670
7368784
87134148
9159416704
104027395330
11113235212800
123501763366904
13118024658758656
144303855119215782
15168777440194263040
167081468496171815500
17316501174908316647424
1815010862087643791689322
19752916261526858377363456

[1,1,4,22,168,1720,22670,368784,7134148,159416704,
 4027395330,113235212800,3501763366904,
 118024658758656,4303855119215782,
 168777440194263040,7081468496171815500,
 316501174908316647424,15010862087643791689322,
 752916261526858377363456]