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A064340 as a simple table

na(n)
01
11
24
328
4256
52704
631168
7380608
84840960
963458560
10851399680
1111635096576
12161396604928
132266669453312
1432166082822144
15460531091685376
166644185553305600
1796498260064403456
181409750653282287616

[1,1,4,28,256,2704,31168,380608,4840960,63458560,
 851399680,11635096576,161396604928,2266669453312,
 32166082822144,460531091685376,6644185553305600,
 96498260064403456,1409750653282287616]