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A059224 as a simple table

na(n)
318
470
5224
6648
71760
84576
911520
1028288
1168096
12161280
13376832
14870400
151990656
164513792
1710158080
1822708224
1950462720
20111542272
21245366784
22537395200
231172307968
242548039680
255519704064
2611920211968
2725669140480

[18,70,224,648,1760,4576,11520,28288,68096,161280,
 376832,870400,1990656,4513792,10158080,22708224,
 50462720,111542272,245366784,537395200,1172307968,
 2548039680,5519704064,11920211968,25669140480]