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A222575 as a simple table

na(n)
15
25
311
456
5134
61500
73999
846250
9126987
101462034
114136257
1246688904
13136406909
141501835282
154510551635
1648637741544
17149382874117
181583951305266
194954925376243
2051834151640684
21164570402519621
221703435934148924

[5,5,11,56,134,1500,3999,46250,126987,1462034,
 4136257,46688904,136406909,1501835282,4510551635,
 48637741544,149382874117,1583951305266,
 4954925376243,51834151640684,164570402519621,
 1703435934148924]