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A027991 as a simple table

na(n)
11
23
312
440
5130
6404
71227
83653
910720
1031090
1189316
12254568
13720757
142029095
155684340
1615855964
1744061862
18122032508
19336966015
20927953705
212549229256
226987648358
2319115124552
2452194037200
25142274514025
26387215773899

[1,3,12,40,130,404,1227,3653,10720,31090,89316,
 254568,720757,2029095,5684340,15855964,44061862,
 122032508,336966015,927953705,2549229256,
 6987648358,19115124552,52194037200,142274514025,
 387215773899]