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A317787 as a simple table

na(n)
11
21
32
44
58
618
740
895
9227
10557
111382
123485
138865
1422790
1559022
16153972
17404066
181066236
192826885
207527411
2120121154

[1,1,2,4,8,18,40,95,227,557,1382,3485,8865,22790,
 59022,153972,404066,1066236,2826885,7527411,
 20121154]