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A081084 as a simple table

na(n)
18
248
3224
4960
565024
6261120
71046528
84190208
9268402688
101073676288
114294836224
1217179607040
1370368727400448
144503599493152768
1518014398241046528
1672057593501057024
17288230375077969920

[8,48,224,960,65024,261120,1046528,4190208,
 268402688,1073676288,4294836224,17179607040,
 70368727400448,4503599493152768,18014398241046528,
 72057593501057024,288230375077969920]