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A006646 as a simple table

na(n)
00
10
22
312
464
5320
61568
77616
836864
9178176
10860672
114156416
1220070400
1396911360
14467935232
152259402752
1610909384704
1752675215360
18254338531328
191228055248896
205929575645184
2128630524624896

[0,0,2,12,64,320,1568,7616,36864,178176,860672,
 4156416,20070400,96911360,467935232,2259402752,
 10909384704,52675215360,254338531328,
 1228055248896,5929575645184,28630524624896]