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A074581 as a simple table

na(n)
00
12
213
381
4504
53136
619513
7121415
8755476
94700770
1029249425
11181997601
121132436852
137046319384
1443844049029
15272809183135
161697490356184
1710562230626642
1865720971788709
19408933139743937
202544489349890656

[0,2,13,81,504,3136,19513,121415,755476,4700770,
 29249425,181997601,1132436852,7046319384,
 43844049029,272809183135,1697490356184,
 10562230626642,65720971788709,408933139743937,
 2544489349890656]