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A156017 as a simple table

na(n)
01
14
224
3176
41440
512608
6115584
71095424
810646016
9105522176
101062623232
1110840977408
12111811534848
131163909087232
1412212421230592
15129027376349184
161371482141884416
1714656212306231296
18157369985643577344
191696975718802522112
2018369603773021552640

[1,4,24,176,1440,12608,115584,1095424,10646016,
 105522176,1062623232,10840977408,111811534848,
 1163909087232,12212421230592,129027376349184,
 1371482141884416,14656212306231296,
 157369985643577344,1696975718802522112,
 18369603773021552640]