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A003288 as a simple table

na(n)
24
324
4152
51080
68152
763976
8518232
94299728
1036360872
11312284536
122716694880
1323891215320
14212064567160
151897551819416

[4,24,152,1080,8152,63976,518232,4299728,36360872,
 312284536,2716694880,23891215320,212064567160,
 1897551819416]