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A087635 as a simple table

na(n)
00
12
212
364
4336
51760
69216
748256
8252672
91323008
106927360
1136272128
12189923328
13994451456
145207015424
1527264286720
16142757658624
17747488804864
183913902194688
1920493457948672
20107305138913280
21561857001684992

[0,2,12,64,336,1760,9216,48256,252672,1323008,
 6927360,36272128,189923328,994451456,5207015424,
 27264286720,142757658624,747488804864,
 3913902194688,20493457948672,107305138913280,
 561857001684992]