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A054660 as a simple table

na(n)
11
22
35
416
551
6170
7585
82048
97280
1026214
1195325
12349520
131290555
144793490
1517895679
1667108864
17252645135
18954437120
193616814565
2013743895344
2152357696365
22199911205050
23764877654105
242932031006720
2511258999068416

[1,2,5,16,51,170,585,2048,7280,26214,95325,349520,
 1290555,4793490,17895679,67108864,252645135,
 954437120,3616814565,13743895344,52357696365,
 199911205050,764877654105,2932031006720,
 11258999068416]