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A246485 as a simple table

na(n)
12
252
33132
431104
5347934
61893780
79714968
835251360
9119069850
10331355220
11869135892
122019732192
134480392182
149156814324
1518041010864
1633514806720
1760460359858
18104364198900
19175893704300
20286474229440
21457427541582

[2,52,3132,31104,347934,1893780,9714968,35251360,
 119069850,331355220,869135892,2019732192,
 4480392182,9156814324,18041010864,33514806720,
 60460359858,104364198900,175893704300,
 286474229440,457427541582]