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A165665 as a simple table

na(n)
01
18
240
3176
4736
53008
612160
748896
8196096
9785408
103143680
1112578816
1250323456
13201310208
14805273600
153221159936
1612884770816
1751539345408
18206157905920
19824632672256
203298532786176
2113194135339008
2252776549744640

[1,8,40,176,736,3008,12160,48896,196096,785408,
 3143680,12578816,50323456,201310208,805273600,
 3221159936,12884770816,51539345408,206157905920,
 824632672256,3298532786176,13194135339008,
 52776549744640]