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A007231 as a simple table

na(n)
11
25
313
452
5121
6455
71093
84305
99841
1036905
1188573
12348728
13797161
142989355
157174453
1628585712
1764570081
18242137805
19581130733
202288202262

[1,5,13,52,121,455,1093,4305,9841,36905,88573,
 348728,797161,2989355,7174453,28585712,64570081,
 242137805,581130733,2288202262]