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A189306 as a simple table

na(n)
13
273
3960
414714
5216708
63224934
747862876
8710856569
910555661105
10156750811549
112327708940824
1234565989342645
13513297241320175
147622351430906057
15113190239801459420
161680850155699514974

[3,73,960,14714,216708,3224934,47862876,710856569,
 10555661105,156750811549,2327708940824,
 34565989342645,513297241320175,7622351430906057,
 113190239801459420,1680850155699514974]