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A171887 as a simple table

na(n)
11
22
34
49
520
650
7147
8269
9992
101000
114297
1276468
1397314
14445519
151315337
162594742
173888902
1891859035
1992411466
201180624310
214501485474
2211288114818
2323434425843

[1,2,4,9,20,50,147,269,992,1000,4297,76468,97314,
 445519,1315337,2594742,3888902,91859035,92411466,
 1180624310,4501485474,11288114818,23434425843]