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A360856 as a simple table

na(n)
01
11
22
36
416
548
6140
7424
81280
93920
1012032
1137184
12115248
13358624
141118784
153499584
1610969344
1734450944
18108377984
19341465344
201077300224
213403006464
2210761447424
2334065967104
24107937899264
25342293526016
261086339120128
273450236511232
2810965437349888

[1,1,2,6,16,48,140,424,1280,3920,12032,37184,
 115248,358624,1118784,3499584,10969344,34450944,
 108377984,341465344,1077300224,3403006464,
 10761447424,34065967104,107937899264,342293526016,
 1086339120128,3450236511232,10965437349888]