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A009543 as a simple table

na(n)
00
11
22
32
48
536
6168
7944
85760
941104
10310304
112650592
1223894144
13237023424
142481859968
1528021573376
16333725331456
174225816615168
1856329065984512
19790713657219584
2011650274400684032
21179579770991391744

[0,1,2,2,8,36,168,944,5760,41104,310304,2650592,
 23894144,237023424,2481859968,28021573376,
 333725331456,4225816615168,56329065984512,
 790713657219584,11650274400684032,
 179579770991391744]