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A197304 as a simple table

na(n)
15
257
3344
43181
527709
6207538
71711736
814233577
9115744195
10943877937
117722480242
1263119151256
13515801027829
144215541002540
1534452043410657
16281566682942645
172301175324848852
1818806797415174573
19153702262527792157

[5,57,344,3181,27709,207538,1711736,14233577,
 115744195,943877937,7722480242,63119151256,
 515801027829,4215541002540,34452043410657,
 281566682942645,2301175324848852,
 18806797415174573,153702262527792157]