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A215973 as a simple table

na(n)
01
12
27
328
4122
5565
62735
713682
870188
9367248
101952394
1110516141
1257265929
13314751625
141743829163
159728561418
1654604800126
17308137127382
181747158309208
199949001656704
2056872435967840
21326243091718978
221877419829207578
2310835354636496321

[1,2,7,28,122,565,2735,13682,70188,367248,1952394,
 10516141,57265929,314751625,1743829163,9728561418,
 54604800126,308137127382,1747158309208,
 9949001656704,56872435967840,326243091718978,
 1877419829207578,10835354636496321]