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A291850 as a simple table

na(n)
18
2256
31944
46655
58192
625000
735937
862208
9134456
10212960
11262144
12344605
13453962
14472392
15692759
16800000
171149984
181288408
191617165
201990656
212970344
224302592
236075000
246814720
258388608
268732691
2711358856
2814526784
2915116544
3019808792
3120796875
3222168288

[8,256,1944,6655,8192,25000,35937,62208,134456,
 212960,262144,344605,453962,472392,692759,800000,
 1149984,1288408,1617165,1990656,2970344,4302592,
 6075000,6814720,8388608,8732691,11358856,14526784,
 15116544,19808792,20796875,22168288]