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A171309 as a simple table

na(n)
14
215
353
4138
5483
61678
75634
818915
962325
10204315
11683210
122277118
137559559
1425132611
1583206528
16274465209
17907716605
183004041236
199908081432

[4,15,53,138,483,1678,5634,18915,62325,204315,
 683210,2277118,7559559,25132611,83206528,
 274465209,907716605,3004041236,9908081432]