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A161168 as a simple table

na(n)
02
16
220
372
4272
51056
64160
716512
865792
9262656
101049600
114196352
1216781312
1367117056
14268451840
151073774592
164295032832
1717180000256
1868719738880
19274878431232
201099512676352
214398048608256
2217592190238720
2370368752566272

[2,6,20,72,272,1056,4160,16512,65792,262656,
 1049600,4196352,16781312,67117056,268451840,
 1073774592,4295032832,17180000256,68719738880,
 274878431232,1099512676352,4398048608256,
 17592190238720,70368752566272]