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A335780 as a simple table

na(n)
11
21
31
41
51
63
77
815
937
1065
11115
12223
13503
141127
152761
166225
1715393
1834915
1984399
20193489
21477727
221113059
232753799
246486011
2516181965
2638447093
2795995579

[1,1,1,1,1,3,7,15,37,65,115,223,503,1127,2761,
 6225,15393,34915,84399,193489,477727,1113059,
 2753799,6486011,16181965,38447093,95995579]