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A003111 as a simple table

na(n)
01
11
23
319
4225
53441
679259
72424195
894471089
94613520889
10275148653115
1119686730313955
121664382756757625

[1,1,3,19,225,3441,79259,2424195,94471089,
 4613520889,275148653115,19686730313955,
 1664382756757625]