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A155018 as a simple table

na(n)
00
11
2181
33787
432768
5174692
6685700
72178889
85931641
914348907
1031622776
1164631634
12124125023
13226242995
14394421215
15661735513
161073741824
171691869691
182597429617
193896296578
205724334022
218253624572
2211699575548
2316328969210

[0,1,181,3787,32768,174692,685700,2178889,5931641,
 14348907,31622776,64631634,124125023,226242995,
 394421215,661735513,1073741824,1691869691,
 2597429617,3896296578,5724334022,8253624572,
 11699575548,16328969210]