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A247989 as a simple table

na(n)
1396
2702
31264
42314
54308
68150
715640
830620
960192
10118756
11235048
12466476
13927792
141850424
153692608
167372360
1714725200
1829421656
1958802272
20117563504
21235061376
22470020240
23939884704
241879539888
253758751936
267517176032

[396,702,1264,2314,4308,8150,15640,30620,60192,
 118756,235048,466476,927792,1850424,3692608,
 7372360,14725200,29421656,58802272,117563504,
 235061376,470020240,939884704,1879539888,
 3758751936,7517176032]