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A316640 as a simple table

na(n)
18
2928
34583
444095
5532401
65879970
769857903
8835457349
99913271027
10118531204693
111418881976069
1216953784846473
13202779552350007
142426142918934889
1529014644493523399
16347062113123737124

[8,928,4583,44095,532401,5879970,69857903,
 835457349,9913271027,118531204693,1418881976069,
 16953784846473,202779552350007,2426142918934889,
 29014644493523399,347062113123737124]