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A056236 as a simple table

na(n)
02
14
212
340
4136
5464
61584
75408
818464
963040
10215232
11734848
122508928
138566016
1429246208
1599852800
16340918784
171163969536
183974040576
1913568223232
2046324811776
21158162800640
22540001579008
231843680714752
246294719700992

[2,4,12,40,136,464,1584,5408,18464,63040,215232,
 734848,2508928,8566016,29246208,99852800,
 340918784,1163969536,3974040576,13568223232,
 46324811776,158162800640,540001579008,
 1843680714752,6294719700992]