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A326898 as a simple table

na(n)
01
12
25
314
447
5186
6904
75439
841418
9404501
105122188
1184623842
121828876351
1351701216248
141908493827243
1591755916071736
165729050033597431

[1,2,5,14,47,186,904,5439,41418,404501,5122188,
 84623842,1828876351,51701216248,1908493827243,
 91755916071736,5729050033597431]