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A219592 as a simple table

na(n)
115
255
3550
44152
526006
6164075
71093496
87362866
947724022
10292277921
111695340197
129384561666
1349848123324
14254860709784
151257031665966
165994561288262
1727703365847356
18124331694874481
19542842646444008

[15,55,550,4152,26006,164075,1093496,7362866,
 47724022,292277921,1695340197,9384561666,
 49848123324,254860709784,1257031665966,
 5994561288262,27703365847356,124331694874481,
 542842646444008]