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A137644 as a simple table

na(n)
01
13
216
395
4591
53780
624620
7162423
81081780
97258053
1048982176
11332140328
122261099491
1315444137880
14105789736896
15726426836103
164998885106599
1734464824536500
18238017084356680
191646234203000485
2011401464090042224
2179060352485691272
22548829398923188036

[1,3,16,95,591,3780,24620,162423,1081780,7258053,
 48982176,332140328,2261099491,15444137880,
 105789736896,726426836103,4998885106599,
 34464824536500,238017084356680,1646234203000485,
 11401464090042224,79060352485691272,
 548829398923188036]