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A276161 as a simple table

na(n)
1840
25040
311880
4175560
5570024
65997600
734234200
870073640
9569729160
101262451960
116643717080
126927399360
1359312218680
14657557188200
151288881113520
167994422608480
179803968814640
1873148660184600
19130903460103024
20250036769127600
211081389616791120

[840,5040,11880,175560,570024,5997600,34234200,
 70073640,569729160,1262451960,6643717080,
 6927399360,59312218680,657557188200,1288881113520,
 7994422608480,9803968814640,73148660184600,
 130903460103024,250036769127600,1081389616791120]