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A258686 as a simple table

na(n)
1386304
25392960
358713912
4479373352
54020536064
628017797984
7180889428840
81121650360344
96319289500688
1034444479406504
11179092290465784
12888630251710856
134294129169205328
1420034775965684704
1591016922993551880

[386304,5392960,58713912,479373352,4020536064,
 28017797984,180889428840,1121650360344,
 6319289500688,34444479406504,179092290465784,
 888630251710856,4294129169205328,
 20034775965684704,91016922993551880]