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A187671 as a simple table

na(n)
124
2550
34044
417716
556080
6150166
7336776
8702408
91330728
102385910
113973400
126550700
1310068336
1415247986
1522545648
1632579360
1745246528
1862983046
1984524916
20113900920
21150370548
22195521534
23249456396
24321513812
25404142192
26504603526

[24,550,4044,17716,56080,150166,336776,702408,
 1330728,2385910,3973400,6550700,10068336,15247986,
 22545648,32579360,45246528,62983046,84524916,
 113900920,150370548,195521534,249456396,321513812,
 404142192,504603526]