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A263286 as a simple table

na(n)
1504
23904
324160
4148510
5913084
65601776
733964920
8205039872
91234800566
107423359962
1144541257728
12267234517138
131602442619004
149609196252702
1557627959084920
16345606365724250
172072764799264240
1812431616909669022

[504,3904,24160,148510,913084,5601776,33964920,
 205039872,1234800566,7423359962,44541257728,
 267234517138,1602442619004,9609196252702,
 57627959084920,345606365724250,2072764799264240,
 12431616909669022]