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A189550 as a simple table

na(n)
140
22000
331280
4204544
5911144
63022220
78655424
821284040
947231344
1096369040
11187026380
12335425808
13582302520
14973424372
151563214444
162426917164
173699260196
185472064152
197976593144
2011351136420
2115868645560
2221892595476

[40,2000,31280,204544,911144,3022220,8655424,
 21284040,47231344,96369040,187026380,335425808,
 582302520,973424372,1563214444,2426917164,
 3699260196,5472064152,7976593144,11351136420,
 15868645560,21892595476]