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A269895 as a simple table

na(n)
10
27
384
4756
56048
645360
7326592
82286144
915676416
10105815808
11705438720
124655895552
1330474952704
14198087192576
151279948013568
168228237230080
1752660718272512
18335712078987264
192132759090036736
2013507474236899328

[0,7,84,756,6048,45360,326592,2286144,15676416,
 105815808,705438720,4655895552,30474952704,
 198087192576,1279948013568,8228237230080,
 52660718272512,335712078987264,2132759090036736,
 13507474236899328]