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A147257 as a simple table

na(n)
11
21
31
41
51
65
717
839
9137
10661
113965
1230475
13261877
142593597
1532463645
16507974205
179631596681
18224195557727
196341197277447
20216685113312141
218987183183859385

[1,1,1,1,1,5,17,39,137,661,3965,30475,261877,
 2593597,32463645,507974205,9631596681,
 224195557727,6341197277447,216685113312141,
 8987183183859385]