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A208141 as a simple table

na(n)
120
2400
33000
414000
549000
6141120
7352800
8792000
91633500
103146000
115725720
129937200
1316562000
1426656000
1541616000
1663256320
1793896100
18136458000
19194579000
20272734000
21376372920
22512072000
23687700000
24912600000
251197787500

[20,400,3000,14000,49000,141120,352800,792000,
 1633500,3146000,5725720,9937200,16562000,26656000,
 41616000,63256320,93896100,136458000,194579000,
 272734000,376372920,512072000,687700000,912600000,
 1197787500]