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A251568 as a simple table

na(n)
01
11
25
343
4529
58501
6169021
74010455
8110676833
93484717129
10123320412181
114847038223171
12209536628422705
139882471447634813
14505033804901100749
1527802319803528367791
161640388588050579832001
17103275015543414629215505
186910877628962983581031333

[1,1,5,43,529,8501,169021,4010455,110676833,
 3484717129,123320412181,4847038223171,
 209536628422705,9882471447634813,
 505033804901100749,27802319803528367791,
 1640388588050579832001,103275015543414629215505,
 6910877628962983581031333]