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A033840 as a simple table

na(n)
12
220
392
416
51056
6212419
7128
813379
940695508
101024
114196352
1213892162580
138192
14268451840
151002493281672
1665536
1717180000256
184998382669357032
19524288
201099512676352
213418993385062038719
224194304
2370368752566272

[2,20,92,16,1056,212419,128,13379,40695508,1024,
 4196352,13892162580,8192,268451840,1002493281672,
 65536,17180000256,4998382669357032,524288,
 1099512676352,3418993385062038719,4194304,
 70368752566272]