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A131991 as a simple table

na(n)
115
240
3156
4400
51464
62380
75220
87240
912720
1025260
1130784
1252060
1370644
1481400
15106080
16151740
17208920
18230764
19305320
20363024
21394420
22499360
23578760
24712980
25922180
261040604
271103440
281236600
291307020
301455780
312064640
322265384

[15,40,156,400,1464,2380,5220,7240,12720,25260,
 30784,52060,70644,81400,106080,151740,208920,
 230764,305320,363024,394420,499360,578760,712980,
 922180,1040604,1103440,1236600,1307020,1455780,
 2064640,2265384]