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A030974 as a simple table

na(n)
12
24
312
450
5254
61524
710669
885357
9768216
107682169
1184503866
121014046395
1313182603137
14184556443918
152768346658779
1644293546540479
17752990291188151
1813553825241386727
19257522679586347822
205150453591726956442

[2,4,12,50,254,1524,10669,85357,768216,7682169,
 84503866,1014046395,13182603137,184556443918,
 2768346658779,44293546540479,752990291188151,
 13553825241386727,257522679586347822,
 5150453591726956442]