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A250360 as a simple table

na(n)
18
264
3512
44091
532608
6259106
72052904
816234706
9128373416
101015004124
118024737888
1263441430784
13501536079048
143964832287906
1531343315384096
16247778886499164
171958768810680376
1815484663643904612
19122410935014171288

[8,64,512,4091,32608,259106,2052904,16234706,
 128373416,1015004124,8024737888,63441430784,
 501536079048,3964832287906,31343315384096,
 247778886499164,1958768810680376,
 15484663643904612,122410935014171288]