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A135917 as a simple table

na(n)
20
34
4112
5859
63640
711250
828544
963217
10126704
11235200
12410800
13682759
141088872
151676974
162506560
173650525
185197024
197251452
209938544
2113404595
2217819800
2323380714
2430312832
2538873289
2649353680
2762083000
2877430704
2995809887
30117680584
31143553190

[0,4,112,859,3640,11250,28544,63217,126704,235200,
 410800,682759,1088872,1676974,2506560,3650525,
 5197024,7251452,9938544,13404595,17819800,
 23380714,30312832,38873289,49353680,62083000,
 77430704,95809887,117680584,143553190]