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Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A108508 as a simple table

na(n)
11
24
312
448
5180
6528
71392
83600
97920
1013680
1121840
1231872
1325008

[1,4,12,48,180,528,1392,3600,7920,13680,21840,
 31872,25008]