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A147424 as a simple table

na(n)
11
21
31
41
51
61
75
813
931
10123
11397
121299
137415
1448549
15328016
162805259
1726286523
18261135019
193222276941
2047592701035
21811402107260
2216468821744235
23385847309545373

[1,1,1,1,1,1,5,13,31,123,397,1299,7415,48549,
 328016,2805259,26286523,261135019,3222276941,
 47592701035,811402107260,16468821744235,
 385847309545373]