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A269716 as a simple table

na(n)
01
15
220
388
4368
51504
66080
724448
898048
9392704
101571840
116289408
1225161728
13100655104
14402636800
151610579968

[1,5,20,88,368,1504,6080,24448,98048,392704,
 1571840,6289408,25161728,100655104,402636800,
 1610579968]