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A016812 as a simple table

na(n)
00
116777216
268719476736
38916100448256
4281474976710656
54096000000000000
636520347436056576
7232218265089212416
81152921504606846976
94738381338321616896
1016777216000000000000
1152654090776777588736

[0,16777216,68719476736,8916100448256,
 281474976710656,4096000000000000,
 36520347436056576,232218265089212416,
 1152921504606846976,4738381338321616896,
 16777216000000000000,52654090776777588736]