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A157856 as a simple table

na(n)
01
115
256
31665
43080
545375
6166376
79718545
88833160
9127944225
10461568296
1113274709555
1223784791240
13339933981675
141211397511016
15137818710619425
1661120313133320
17865798969339725
183061200012378536
1986466681946098645
20152460758526595400

[1,15,56,1665,3080,45375,166376,9718545,8833160,
 127944225,461568296,13274709555,23784791240,
 339933981675,1211397511016,137818710619425,
 61120313133320,865798969339725,3061200012378536,
 86466681946098645,152460758526595400]