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A016751 as a simple table

na(n)
00
12048
24194304
3362797056
48589934592
5100000000000
6743008370688
74049565169664
817592186044416
964268410079232
10204800000000000
11584318301411328
121521681143169024
133670344486987776
148293509467471872
1517714700000000000
1636028797018963968
1770188843638032384

[0,2048,4194304,362797056,8589934592,100000000000,
 743008370688,4049565169664,17592186044416,
 64268410079232,204800000000000,584318301411328,
 1521681143169024,3670344486987776,
 8293509467471872,17714700000000000,
 36028797018963968,70188843638032384]