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A286028 as a simple table

na(n)
01
12
20
312
41
556
61
7240
81
9996
103
114044
120
1316256
1428
1565281
1624
17261728
181
191047696
200
214192259
22496
2316773127
2464
2567102265
26192
27268421177
28448
291073709088
304161
314294901792
321104
3317179768832
341091
3568719247368
3667
37274877382688
38101443

[1,2,0,12,1,56,1,240,1,996,3,4044,0,16256,28,
 65281,24,261728,1,1047696,0,4192259,496,16773127,
 64,67102265,192,268421177,448,1073709088,4161,
 4294901792,1104,17179768832,1091,68719247368,67,
 274877382688,101443]