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A186924 as a simple table

na(n)
01
14
212
328
460
5120
6228
7416
8732
91252
102088
113408
125460
138600
1413344
1520424
1630876
1746152
1868268
19100016
20145224
21209120
22298800
23423840
24597108
25835804
261162824
271608508
282212896
293028632
304124664
315590976
327544604
3310137264
3413565016

[1,4,12,28,60,120,228,416,732,1252,2088,3408,5460,
 8600,13344,20424,30876,46152,68268,100016,145224,
 209120,298800,423840,597108,835804,1162824,
 1608508,2212896,3028632,4124664,5590976,7544604,
 10137264,13565016]