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A064416 as a simple table

na(n)
01
12
25
311
426
559
6137
7312
8719
91651
103816
118757
1220202
1346440
14106957
15245989
16566561
171303968
183002247
196910122
2015909143

[1,2,5,11,26,59,137,312,719,1651,3816,8757,20202,
 46440,106957,245989,566561,1303968,3002247,
 6910122,15909143]