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A273902 as a simple table

na(n)
21
32
46
520
664
7204
8656
92120
106873
1122350
1272881
13238232
14780384
152561164
168419766
1727721784
1891397927
19301710074
20997087170
213298556716
2210922576840
2336199599880
24120068987717
25398547827336
261323821438203
274400043488826
2814633372199291

[1,2,6,20,64,204,656,2120,6873,22350,72881,238232,
 780384,2561164,8419766,27721784,91397927,
 301710074,997087170,3298556716,10922576840,
 36199599880,120068987717,398547827336,
 1323821438203,4400043488826,14633372199291]