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A267527 as a simple table

na(n)
01
12
25
311
487
5175
61375
72751
821887
943775
10349695
11699391
125593087
1311186175
1489481215
15178962431
161431666687
172863333375
1822906535935
1945813071871
20366504050687
21733008101375
225864062713855
2311728125427711
2493824995033087
25187649990066175

[1,2,5,11,87,175,1375,2751,21887,43775,349695,
 699391,5593087,11186175,89481215,178962431,
 1431666687,2863333375,22906535935,45813071871,
 366504050687,733008101375,5864062713855,
 11728125427711,93824995033087,187649990066175]