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A056460 as a simple table

na(n)
14
20
312
412
560
648
7252
8240
91008
10960
114092
124020
1316380
1416128
1565460
1665280
17262140
18261072
191048572
201047540
214194036
224190208
2316777212
2416772880
2567108800
2667092480
27268434432
28268419060
291073741820
301073675280
314294967292
324294901760
3317179865076
3417179607040
3568719476420

[4,0,12,12,60,48,252,240,1008,960,4092,4020,16380,
 16128,65460,65280,262140,261072,1048572,1047540,
 4194036,4190208,16777212,16772880,67108800,
 67092480,268434432,268419060,1073741820,
 1073675280,4294967292,4294901760,17179865076,
 17179607040,68719476420]