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A299306 as a simple table

na(n)
18
22048
313075
4144040
53860858
676611604
71227812226
823819382545
9471369052777
108749447076371
11164571560365968
123152188315142786
1359832211663862100
141132092731063667371
1521504285978321722965

[8,2048,13075,144040,3860858,76611604,1227812226,
 23819382545,471369052777,8749447076371,
 164571560365968,3152188315142786,
 59832211663862100,1132092731063667371,
 21504285978321722965]