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A286020 as a simple table

na(n)
01
12
20
312
41
556
63
7240
84
9993
100
114041
1216
1316257
140
1565337
1664
17261633
1816
191047745
20260
214192273
2264
2316774047
241024
2567100704
2667
27268422144
284883
291073709248
3019
314294917632
3216531
3317179741696
3419
3568719267400
3677955
37274877383176
381059

[1,2,0,12,1,56,3,240,4,993,0,4041,16,16257,0,
 65337,64,261633,16,1047745,260,4192273,64,
 16774047,1024,67100704,67,268422144,4883,
 1073709248,19,4294917632,16531,17179741696,19,
 68719267400,77955,274877383176,1059]