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A145956 as a simple table

na(n)
11
21
31
41
51
63
77
813
937
10103
11343
121549
137241
1437919
15236383
161636125
1713465687
18128312593
191395150187
2017424865195
21251739719221
224153202993611
2379756129711801
241753738354816013
2544633769685103851
261301658659951823679

[1,1,1,1,1,3,7,13,37,103,343,1549,7241,37919,
 236383,1636125,13465687,128312593,1395150187,
 17424865195,251739719221,4153202993611,
 79756129711801,1753738354816013,44633769685103851,
 1301658659951823679]