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A038508 as a simple table

na(n)
01
12
25
312
430
576
6196
7512
81352
93600
109648
1125984
1270240
13190400
14517184
151406976
163831936
1710445056
1828488448
1977735936
20212186624
21579320832
221581966336
234320477184
2411800692736
2532233951232

[1,2,5,12,30,76,196,512,1352,3600,9648,25984,
 70240,190400,517184,1406976,3831936,10445056,
 28488448,77735936,212186624,579320832,1581966336,
 4320477184,11800692736,32233951232]