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A146464 as a simple table

na(n)
11
21
31
41
51
67
721
855
9263
101645
1113423
12126629
131447199
1421743065
15415978809
169965909653
17303132585251
1811591760284391
19555704916934105
2033613901189599473
212574475177790739409

[1,1,1,1,1,7,21,55,263,1645,13423,126629,1447199,
 21743065,415978809,9965909653,303132585251,
 11591760284391,555704916934105,33613901189599473,
 2574475177790739409]