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A006012 as a simple table

na(n)
01
12
26
320
468
5232
6792
72704
89232
931520
10107616
11367424
121254464
134283008
1414623104
1549926400
16170459392
17581984768
181987020288
196784111616
2023162405888
2179081400320
22270000789504
23921840357376
243147359850496

[1,2,6,20,68,232,792,2704,9232,31520,107616,
 367424,1254464,4283008,14623104,49926400,
 170459392,581984768,1987020288,6784111616,
 23162405888,79081400320,270000789504,921840357376,
 3147359850496]