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A126220 as a simple table

na(n)
01
12
25
314
440
5116
6344
71040
83188
99880
1030912
1197520
12309856
13990656
143184672
1510287808
1633379072
17108724864
18355405568
191165521408
203833497408
2112642775424
2241799227392
23138512751360
24459973953024
251530498526208

[1,2,5,14,40,116,344,1040,3188,9880,30912,97520,
 309856,990656,3184672,10287808,33379072,108724864,
 355405568,1165521408,3833497408,12642775424,
 41799227392,138512751360,459973953024,
 1530498526208]