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A061815 as a simple table

na(n)
01
11
22
35
414
542
6133
7433
81455
94958
1017247
1160502
12215353
13770865
142789365
1510134529
1637130526
17136451349
18504837219
191872121732
206980767968
2126078614284
2297872756530
23367861581953
241388061197005
255243972732886

[1,1,2,5,14,42,133,433,1455,4958,17247,60502,
 215353,770865,2789365,10134529,37130526,136451349,
 504837219,1872121732,6980767968,26078614284,
 97872756530,367861581953,1388061197005,
 5243972732886]