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A296840 as a simple table

na(n)
11
25
323
4185
51721
615545
7277689
85586105
9113081529
102289863865
1146369706169
12986739675321
1326376728842425
14711906436354233
1519221208539173049
16518972365315281081
1722132599848083154505
18944314039112845753929
1940290722114409383329353

[1,5,23,185,1721,15545,277689,5586105,113081529,
 2289863865,46369706169,986739675321,
 26376728842425,711906436354233,19221208539173049,
 518972365315281081,22132599848083154505,
 944314039112845753929,40290722114409383329353]