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A097682 as a simple table

na(n)
01
18
264
3512
44096
532768
6262144
72097152
816817536
9137443328
101215668224
1113131579392
12186802241536
133194809745408
1457299125141504
151002518381330432
1616747075923705856
17268695698674024448
184294396462470529024

[1,8,64,512,4096,32768,262144,2097152,16817536,
 137443328,1215668224,13131579392,186802241536,
 3194809745408,57299125141504,1002518381330432,
 16747075923705856,268695698674024448,
 4294396462470529024]