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A006661 as a simple table

na(n)
53
63
77
811
928
1057
11155
12353
131003
142458
157214
1618575
1755880
18149183
19457639
201255933
213914103
2210978240
2334663182
2498953078
25315884786
26915008430
272948378068
288645874055
2928084475514
3083222134020

[3,3,7,11,28,57,155,353,1003,2458,7214,18575,
 55880,149183,457639,1255933,3914103,10978240,
 34663182,98953078,315884786,915008430,2948378068,
 8645874055,28084475514,83222134020]