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A055550 as a simple table

na(n)
10
20
33
422
578
6245
7750
82057
95597
1014884
1138975
12101629
13264239
14687007
151801533
164744920
1712604009
1833763684
1991210364

[0,0,3,22,78,245,750,2057,5597,14884,38975,101629,
 264239,687007,1801533,4744920,12604009,33763684,
 91210364]