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A015562 as a simple table

na(n)
00
11
27
354
4413
53161
624192
7185149
81417003
910844766
1082998377
11635212469
124861479168
1337206416521
14284752311487
152179298263014
1616678849398533
17127648437104801
18976933306726272
197476775332607909
2057222093861886723

[0,1,7,54,413,3161,24192,185149,1417003,10844766,
 82998377,635212469,4861479168,37206416521,
 284752311487,2179298263014,16678849398533,
 127648437104801,976933306726272,7476775332607909,
 57222093861886723]