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A273508 as a simple table

na(n)
136998208
2449519625
32367885312
48016025680
59563569561
614753560033
726971693632
828769256000
961358997609
10151544659968
11225128651328
12278450575201
13282429583137
14310289733000
15310289733000
16327699806625
17498700534033
18513025643520
19578097000000

[36998208,449519625,2367885312,8016025680,
 9563569561,14753560033,26971693632,28769256000,
 61358997609,151544659968,225128651328,
 278450575201,282429583137,310289733000,
 310289733000,327699806625,498700534033,
 513025643520,578097000000]