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A354409 as a simple table

na(n)
20
31
44
513
682
7579
84752
943390
10440192
114890741
1259245120
13775596313
1410930514688
15164806652728
162649865335040
1745226435601207
18817154768973824
1915574618910994665
20312426715251262464
216577619798222863696
22145060238642780180480
233343382818203784146955

[0,1,4,13,82,579,4752,43390,440192,4890741,
 59245120,775596313,10930514688,164806652728,
 2649865335040,45226435601207,817154768973824,
 15574618910994665,312426715251262464,
 6577619798222863696,145060238642780180480,
 3343382818203784146955]