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A138411 as a simple table

na(n)
148
2648
315000
4115248
51756920
64798248
724054048
846915560
9147756048
10594116040
11886580160
122563852248
134747278480
146317944248
1510774335648
1622156470648
1742168416280
1851506528520
1990438231048
20128074872240

[48,648,15000,115248,1756920,4798248,24054048,
 46915560,147756048,594116040,886580160,2563852248,
 4747278480,6317944248,10774335648,22156470648,
 42168416280,51506528520,90438231048,128074872240]