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A017431 as a simple table

na(n)
02187
1105413504
26103515625
378364164096
4506623120463
52207984167552
67446353252589
720971520000000
851676101935731
9114868566764928
10235260548044817
11450766669594624
12817215093984375
131414067010444416

[2187,105413504,6103515625,78364164096,
 506623120463,2207984167552,7446353252589,
 20971520000000,51676101935731,114868566764928,
 235260548044817,450766669594624,817215093984375,
 1414067010444416]