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A221701 as a simple table

na(n)
28
336
4160
5696
62978
712592
852788
9219888
10911480
113763832
1215494608
1363627024
14260733598
151066567352
164356387548
1717770522592
1872407072528
19294732200792
201198639773728
214870853772752
2219779319412708
2380266979450624
24325542118876520
251319605521277216
265346467285085648
2721651719411554992
2887646668885161696
29354657520759569056

[8,36,160,696,2978,12592,52788,219888,911480,
 3763832,15494608,63627024,260733598,1066567352,
 4356387548,17770522592,72407072528,294732200792,
 1198639773728,4870853772752,19779319412708,
 80266979450624,325542118876520,1319605521277216,
 5346467285085648,21651719411554992,
 87646668885161696,354657520759569056]