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A228640 as a simple table

na(n)
00
11
26
333
4280
53145
646956
7823585
816781472
9387422001
1010000100440
11285311670721
128916103479504
13302875106592409
1411112006930972780
15437893890382391745
1618446744078004651136
17827240261886336764449
1839346408075494964903956
191978419655660313589124321

[0,1,6,33,280,3145,46956,823585,16781472,
 387422001,10000100440,285311670721,8916103479504,
 302875106592409,11112006930972780,
 437893890382391745,18446744078004651136,
 827240261886336764449,39346408075494964903956,
 1978419655660313589124321]