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A005397 as a simple table

na(n)
34
40
50
64
728
880
9120
10120
11264
121080
133120
146440
1511960
1626688
1770448
18179340
19415796
20935560
212195536
225374468
2313145420
2431504224
2574955600
26180228984
27438624648
281069909344
292600077824
306310088640
3115363918432

[4,0,0,4,28,80,120,120,264,1080,3120,6440,11960,
 26688,70448,179340,415796,935560,2195536,5374468,
 13145420,31504224,74955600,180228984,438624648,
 1069909344,2600077824,6310088640,15363918432]