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A055553 as a simple table

na(n)
10
20
31
47
516
643
7105
8255
9646
101547
113605
128241
1319279
1444706
15105212
16246683
17585355
181401644
193381806
208220777
2120138200
2249679870

[0,0,1,7,16,43,105,255,646,1547,3605,8241,19279,
 44706,105212,246683,585355,1401644,3381806,
 8220777,20138200,49679870]