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A030910 as a simple table

na(n)
12
24
312
449
5249
61499
710493
883946
9755519
107555194
1183107140
12997285682
1312964713872
14181505994212
152722589913192
1643561438611080
17740544456388374
1813329800214990740
19253266204084824069
205065324081696481381

[2,4,12,49,249,1499,10493,83946,755519,7555194,
 83107140,997285682,12964713872,181505994212,
 2722589913192,43561438611080,740544456388374,
 13329800214990740,253266204084824069,
 5065324081696481381]