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A240283 as a simple table

na(n)
18
2741
320764
4443168
513490093
6281488213
78199368365
8225885684501
95291794810655
10154532568331772
113942966914718387
12100514669722453440
132799309114801417209
1470561458133827649660
151875054289432696736342

[8,741,20764,443168,13490093,281488213,8199368365,
 225885684501,5291794810655,154532568331772,
 3942966914718387,100514669722453440,
 2799309114801417209,70561458133827649660,
 1875054289432696736342]