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A035291 as a simple table

na(n)
10
20
316
488
5280
6680
71400
82576
94368
106960
1110560
1215400
1321736
1429848
1540040
1652640
1768000
1886496
19108528
20134520
21164920
22200200
23240856
24287408
25340400
26400400
27468000
28543816
29628488
30722680
31827080
32942400
331069376
341208768

[0,0,16,88,280,680,1400,2576,4368,6960,10560,
 15400,21736,29848,40040,52640,68000,86496,108528,
 134520,164920,200200,240856,287408,340400,400400,
 468000,543816,628488,722680,827080,942400,1069376,
 1208768]