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A249981 as a simple table

na(n)
116
2154
31744
419574
5237348
62886016
735380112
8446342246
95529256528
1070948896558
11887325882364
1211494042429460
13144804789146232
141887744535279984
1523911022925991996
16313197804513008262

[16,154,1744,19574,237348,2886016,35380112,
 446342246,5529256528,70948896558,887325882364,
 11494042429460,144804789146232,1887744535279984,
 23911022925991996,313197804513008262]