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A109467 as a simple table

na(n)
01
126
2256
32472
425056
5250016
62499456
725002112
8249995776
92500000256
1025000032256
11249999869952
122500000260096
1325000000004096
14249999997894656
152500000008404992
1624999999983190016
17250000000000065536
182500000000134086656
1924999999999463391232

[1,26,256,2472,25056,250016,2499456,25002112,
 249995776,2500000256,25000032256,249999869952,
 2500000260096,25000000004096,249999997894656,
 2500000008404992,24999999983190016,
 250000000000065536,2500000000134086656,
 24999999999463391232]