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A185270 as a simple table

na(n)
00
1648
241472
3472392
42654208
510125000
630233088
776236552
8169869312
9344373768
10648000000
111147971528
121934917632
133127772232
144879139328
157381125000
1610871635968
1715641144712
1822039921152
1930485730888
2041472000000
2155576446408
2273470177792
2395927256072

[0,648,41472,472392,2654208,10125000,30233088,
 76236552,169869312,344373768,648000000,1147971528,
 1934917632,3127772232,4879139328,7381125000,
 10871635968,15641144712,22039921152,30485730888,
 41472000000,55576446408,73470177792,95927256072]