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A375806 as a simple table

na(n)
01
12
26
330
4192
51520
614220
7153720
81881600
925728192
10388402560
116415960320
12115078138560
132227056923520
1446247253212160
151025696098627200
1624195406204569600
17604862279807385600
1815973029429800002560
19444299711254300661760
2012983645995613669376000

[1,2,6,30,192,1520,14220,153720,1881600,25728192,
 388402560,6415960320,115078138560,2227056923520,
 46247253212160,1025696098627200,24195406204569600,
 604862279807385600,15973029429800002560,
 444299711254300661760,12983645995613669376000]