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A254203 as a simple table

na(n)
15
216
368
4315
51653
69126
750166
8266060
91445197
108388620
1149943639
12291356973
131672450652
149817427902
1560070829938
16373040809711
172261787393319

[5,16,68,315,1653,9126,50166,266060,1445197,
 8388620,49943639,291356973,1672450652,9817427902,
 60070829938,373040809711,2261787393319]