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A020522 as a simple table

na(n)
00
12
212
356
4240
5992
64032
716256
865280
9261632
101047552
114192256
1216773120
1367100672
14268419072
151073709056
164294901760
1717179738112
1868719214592
19274877382656
201099510579200
214398044413952
2217592181850112
2370368735789056
24281474959933440

[0,2,12,56,240,992,4032,16256,65280,261632,
 1047552,4192256,16773120,67100672,268419072,
 1073709056,4294901760,17179738112,68719214592,
 274877382656,1099510579200,4398044413952,
 17592181850112,70368735789056,281474959933440]