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A284756 as a simple table

na(n)
01
14
228
3268
43004
536784
6476476
76418192
888986172
91261473136
1018200713168
11266393373712
123945664966204
1359029237351504
14890697897694192
1513539585443232688
16207149418061499452
173187355160332835184
1849290960047575223824
19765703166164798253392

[1,4,28,268,3004,36784,476476,6418192,88986172,
 1261473136,18200713168,266393373712,3945664966204,
 59029237351504,890697897694192,13539585443232688,
 207149418061499452,3187355160332835184,
 49290960047575223824,765703166164798253392]