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A255667 as a simple table

na(n)
165536
2262144
31020000
43083292
57323894
615269184
729577432
853275408
990990131
10149141772
11236469626
12364664160
13549120490
14809830656
151172434356
161669450392
172341713998
183240048488
194427203308
205980094628
217992389097

[65536,262144,1020000,3083292,7323894,15269184,
 29577432,53275408,90990131,149141772,236469626,
 364664160,549120490,809830656,1172434356,
 1669450392,2341713998,3240048488,4427203308,
 5980094628,7992389097]