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A109498 as a simple table

na(n)
01
13
215
3111
4951
58463
675975
7683391
86149751
955346223
10498112935
114483010271
1240347080151
13363123696783
143268113221895
1529413018898751
16264717169892151
172382454528636143
1821442090756938855

[1,3,15,111,951,8463,75975,683391,6149751,
 55346223,498112935,4483010271,40347080151,
 363123696783,3268113221895,29413018898751,
 264717169892151,2382454528636143,
 21442090756938855]