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A246036 as a simple table

na(n)
01
16
220
388
4336
51376
65440
721888
887296
9349696
101397760
115593088
1222368256
1389481216
14357908480
151431666688
165726601216
1722906535936
1891625881600
19366504050688
201466015154176
215864062713856
2223456246661120
2393824995033088
24375299963355136
251501199886974976
266004799480791040
2724019198057381888

[1,6,20,88,336,1376,5440,21888,87296,349696,
 1397760,5593088,22368256,89481216,357908480,
 1431666688,5726601216,22906535936,91625881600,
 366504050688,1466015154176,5864062713856,
 23456246661120,93824995033088,375299963355136,
 1501199886974976,6004799480791040,
 24019198057381888]