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A015540 as a simple table

na(n)
00
11
25
331
4185
51111
66665
739991
8239945
91439671
108638025
1151828151
12310968905
131865813431
1411194880585
1567169283511
16403015701065
172418094206391
1814508565238345
1987051391430071
20522308348580425

[0,1,5,31,185,1111,6665,39991,239945,1439671,
 8638025,51828151,310968905,1865813431,11194880585,
 67169283511,403015701065,2418094206391,
 14508565238345,87051391430071,522308348580425]