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A066259 as a simple table

na(n)
11
24
318
475
5320
61352
75733
824276
9102850
10435655
111845504
127817616
1333116057
14140281700
15594243090
162517253683
1710663258432
1845170286424
19191344405725
20810547906740
213433536036866
2214544692047439
2361612304237568

[1,4,18,75,320,1352,5733,24276,102850,435655,
 1845504,7817616,33116057,140281700,594243090,
 2517253683,10663258432,45170286424,191344405725,
 810547906740,3433536036866,14544692047439,
 61612304237568]