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A064621 as a simple table

na(n)
11
23
36
413
520
662
7113
8224
9367
10494
11833
129169
13131313
14155719
15180118
16280766754
173454917187
1831685027464
19152431947617
20629621648241

[1,3,6,13,20,62,113,224,367,494,833,9169,131313,
 155719,180118,280766754,3454917187,31685027464,
 152431947617,629621648241]