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A230931 as a simple table

na(n)
18
248
3232
41242
56896
637984
7208172
81142054
96269172
1034409586
11188850410
121036485334
135688689754
1431221981876
15171359511448
16940494098820
175161833500756
1828330347062146
19155489043088298
20853390273229980

[8,48,232,1242,6896,37984,208172,1142054,6269172,
 34409586,188850410,1036485334,5688689754,
 31221981876,171359511448,940494098820,
 5161833500756,28330347062146,155489043088298,
 853390273229980]