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A115340 as a simple table

na(n)
21
31
42
55
614
750
8233
91248
107593
1149536
12339483
132404472
1417468202
15129459090
16975647292
177458907217
1857744122366
19452028275567
203573870490382

[1,1,2,5,14,50,233,1248,7593,49536,339483,2404472,
 17468202,129459090,975647292,7458907217,
 57744122366,452028275567,3573870490382]