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A016939 as a simple table

na(n)
0128
12097152
2105413504
31280000000
48031810176
534359738368
6114415582592
7319277809664
8781250000000
91727094849536
103521614606208
116722988818432
1212151280273024
1320971520000000
1434792782221696
1555784660123648
1686812553324672
17131593177923584
18194871710000000

[128,2097152,105413504,1280000000,8031810176,
 34359738368,114415582592,319277809664,
 781250000000,1727094849536,3521614606208,
 6722988818432,12151280273024,20971520000000,
 34792782221696,55784660123648,86812553324672,
 131593177923584,194871710000000]