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A251969 as a simple table

na(n)
11600
220000
3250000
41750000
512250000
660025000
7294122500
81129430400
94337012736
1013940398080
1144808422400
12125737920000
13352836000000
14889440750000
152242131890625
165181815925000
1711975752360000
1825758754621600

[1600,20000,250000,1750000,12250000,60025000,
 294122500,1129430400,4337012736,13940398080,
 44808422400,125737920000,352836000000,
 889440750000,2242131890625,5181815925000,
 11975752360000,25758754621600]