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A281051 as a simple table

na(n)
10
26
368
4376
51492
64988
715028
842252
9113076
10291660
11731060
121791052
134306868
1410197068
1523828404
1655060556
17125999028
18285894732
19643864500
201440442444
213203438516
227086237772
2315599703988
2434190878796
2574638727092
26162339448908

[0,6,68,376,1492,4988,15028,42252,113076,291660,
 731060,1791052,4306868,10197068,23828404,55060556,
 125999028,285894732,643864500,1440442444,
 3203438516,7086237772,15599703988,34190878796,
 74638727092,162339448908]