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A176042 as a simple table

na(n)
31
41
52
65
720
842
9238
10511
113311
127423
1352273
14119739
15894950
162087761
1716317275
1838616848
19312598141
20748492526
216233339701
2215070028915
23128475055100
24313137867019
252722580871465
266681890398543
2759076953846060
28145856049509351
291308316471338448

[1,1,2,5,20,42,238,511,3311,7423,52273,119739,
 894950,2087761,16317275,38616848,312598141,
 748492526,6233339701,15070028915,128475055100,
 313137867019,2722580871465,6681890398543,
 59076953846060,145856049509351,1308316471338448]