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A246877 as a simple table

na(n)
520
664
7336
81160
95896
1024652
11117628
12531136
132559552
1412142320
1559416808
16290915560
171449601452
187269071976
1936877764000
20188484835300
21972003964976
225049059855636
2326423287218612
24139205945578944

[20,64,336,1160,5896,24652,117628,531136,2559552,
 12142320,59416808,290915560,1449601452,7269071976,
 36877764000,188484835300,972003964976,
 5049059855636,26423287218612,139205945578944]