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A028198 as a simple table

na(n)
01
137
2870
316610
4281171
54403367
665339080
7932218420
812912631941
9174806957897
102323925673290
1130446318392230
12394142295428311
135052076439311627
1464222440261259500
15810705252920074040

[1,37,870,16610,281171,4403367,65339080,932218420,
 12912631941,174806957897,2323925673290,
 30446318392230,394142295428311,5052076439311627,
 64222440261259500,810705252920074040]