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A081298 as a simple table

na(n)
01
11
27
325
4461
52821
684883
7734161
830684601
9342800821
1018348174791
11251203133545
1216394732478853
13265727053328101
1420464206411678331
15383172119935376161
1634011762638354230001
17722380674949394645269

[1,1,7,25,461,2821,84883,734161,30684601,
 342800821,18348174791,251203133545,16394732478853,
 265727053328101,20464206411678331,
 383172119935376161,34011762638354230001,
 722380674949394645269]