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A306504 as a simple table

na(n)
01
12
25
316
446
5128
6366
71048
82983
98498
1024235
1169088
12196924
13561360
141600252
154561680
1613003565
1737068242
18105667377
19301217072
20858654442
212447694896
226977439850
2319890006440
2456698785235
25161626505250
26460735217111
271313379512256
283743941595128
2910672542499296

[1,2,5,16,46,128,366,1048,2983,8498,24235,69088,
 196924,561360,1600252,4561680,13003565,37068242,
 105667377,301217072,858654442,2447694896,
 6977439850,19890006440,56698785235,161626505250,
 460735217111,1313379512256,3743941595128,
 10672542499296]