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A098470 as a simple table

na(n)
51
66
728
8112
9414
101452
114917
1216236
1352624
14168168
15531531
161665456
175182008
1816031952
1949366674
20151419816
21462919401
221411306358
234292487562
2413029127584
2539478598170
26119439969220
27360881425710
281089126806040

[1,6,28,112,414,1452,4917,16236,52624,168168,
 531531,1665456,5182008,16031952,49366674,
 151419816,462919401,1411306358,4292487562,
 13029127584,39478598170,119439969220,360881425710,
 1089126806040]