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A281019 as a simple table

na(n)
11
21
31
42
52
68
78
832
996
10576
11576
124608
134608
1436864
15258048
162064384
172064384
1824772608
1924772608
20297271296
212675441664
2232105299968
2332105299968
24513684799488
252568423997440
2635957935964160
27323621423677440
285177942778839040
295177942778839040

[1,1,1,2,2,8,8,32,96,576,576,4608,4608,36864,
 258048,2064384,2064384,24772608,24772608,
 297271296,2675441664,32105299968,32105299968,
 513684799488,2568423997440,35957935964160,
 323621423677440,5177942778839040,5177942778839040]