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A268787 as a simple table

na(n)
120
2338
34207
446195
5477128
64725018
745515227
8429442918
93988796543
1036591758790
11332327545513
122993282062865
1326773510121640
14238060527618025
152105957538309226
1618547209960131466
17162707970808249851

[20,338,4207,46195,477128,4725018,45515227,
 429442918,3988796543,36591758790,332327545513,
 2993282062865,26773510121640,238060527618025,
 2105957538309226,18547209960131466,
 162707970808249851]