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A223425 as a simple table

na(n)
115
240
3120
4356
51088
63276
710052
830380
993296
10282240
11866908
122623264
138057756
1424384556
1574901596
16226673608
17696270792
182107127204
196472442928
2019587617308
2160167110388
22182084416108
23559307110768
241692637810416
255199260845212

[15,40,120,356,1088,3276,10052,30380,93296,282240,
 866908,2623264,8057756,24384556,74901596,
 226673608,696270792,2107127204,6472442928,
 19587617308,60167110388,182084416108,559307110768,
 1692637810416,5199260845212]