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A138446 as a simple table

na(n)
16
272
31560
411760
5177144
6482664
72413728
84704552
914803536
1059482248
1188750272
12256572504
13475010256
14632136120
151077921312
162216435832
174218053016
185152037064
199045837768
2012810027888
2115133422096
2224308744928

[6,72,1560,11760,177144,482664,2413728,4704552,
 14803536,59482248,88750272,256572504,475010256,
 632136120,1077921312,2216435832,4218053016,
 5152037064,9045837768,12810027888,15133422096,
 24308744928]