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A275871 as a simple table

na(n)
01
11
24
315
461
5272
61317
76865
838278
9227093
101426921
119457918
1265898275
13481177881
143672102116
1529218285875
16241873478425
172079079678176
1818524191138689
19170803860905237
201627465240969382

[1,1,4,15,61,272,1317,6865,38278,227093,1426921,
 9457918,65898275,481177881,3672102116,29218285875,
 241873478425,2079079678176,18524191138689,
 170803860905237,1627465240969382]