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A064625 as a simple table

na(n)
01
11
215
31025
4209135
5100482849
697657699279
7172687606607425
8513828770061202095
92422699282016359575905
1017259669919850500726265231
11178741720937382151333667162241
122605965447000176066894638515610735

[1,1,15,1025,209135,100482849,97657699279,
 172687606607425,513828770061202095,
 2422699282016359575905,17259669919850500726265231,
 178741720937382151333667162241,
 2605965447000176066894638515610735]