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A051272 as a simple table

na(n)
10
21
315
4147
51799
624207
7418223
88040555
9186596999
105447822127
11169904385683
126317118444315
13260105476063019
1411228680258501647
15529602053223466643
1628154196550210395195
171665532558389396635999

[0,1,15,147,1799,24207,418223,8040555,186596999,
 5447822127,169904385683,6317118444315,
 260105476063019,11228680258501647,
 529602053223466643,28154196550210395195,
 1665532558389396635999]