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A297992 as a simple table

na(n)
18
21933
33820
414888
562390
6290466
71276012
85745438
926249179
10117931466
11529767543
122397639048
1310849215458
1449036526523
15221822852403
161003695687810
174540550678347
1820545128422585
1992986082536821
20420869471627171

[8,1933,3820,14888,62390,290466,1276012,5745438,
 26249179,117931466,529767543,2397639048,
 10849215458,49036526523,221822852403,
 1003695687810,4540550678347,20545128422585,
 92986082536821,420869471627171]