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A055274 as a simple table

na(n)
01
17
256
3448
43584
528672
6229376
71835008
814680064
9117440512
10939524096
117516192768
1260129542144
13481036337152
143848290697216
1530786325577728
16246290604621824
171970324836974592
1815762598695796736
19126100789566373888
201008806316530991104

[1,7,56,448,3584,28672,229376,1835008,14680064,
 117440512,939524096,7516192768,60129542144,
 481036337152,3848290697216,30786325577728,
 246290604621824,1970324836974592,
 15762598695796736,126100789566373888,
 1008806316530991104]