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A045664 as a simple table

na(n)
01
12
24
318
448
5150
6324
7882
81920
94536
109900
1122506
1248240
13106470
14227556
15490950
161044480
172228190
184708368
199961434
2020950800
2144037378
2292229588
23192937938
24402549120
25838860000
261744617420
273623864832
287515733680

[1,2,4,18,48,150,324,882,1920,4536,9900,22506,
 48240,106470,227556,490950,1044480,2228190,
 4708368,9961434,20950800,44037378,92229588,
 192937938,402549120,838860000,1744617420,
 3623864832,7515733680]