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A181214 as a simple table

na(n)
18
264
3400
42500
516100
6103684
7665252
84268356
927399292
10175880644
111128941012
127246435876
1346513697660
14298563888100
151916431442740
1612301251494596
1778959676072668
18506828955431044
193253250254953428
2020882069005614436

[8,64,400,2500,16100,103684,665252,4268356,
 27399292,175880644,1128941012,7246435876,
 46513697660,298563888100,1916431442740,
 12301251494596,78959676072668,506828955431044,
 3253250254953428,20882069005614436]