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A003674 as a simple table

na(n)
00
13
26
336
4120
5528
62016
78256
832640
9131328
10523776
112098176
128386560
1333558528
14134209536
15536887296
162147450880
178590000128
1834359607296
19137439215616
20549755289600
212199024304128
228796090925056

[0,3,6,36,120,528,2016,8256,32640,131328,523776,
 2098176,8386560,33558528,134209536,536887296,
 2147450880,8590000128,34359607296,137439215616,
 549755289600,2199024304128,8796090925056]