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A138717
as a simple table
n
a(n)
1
24918
2
1235652
3
3250531482
4
4199242278
5
13709099778
6
23871182760
7
86428949742
8
126606734382
9
168135540408
[24918,1235652,3250531482,4199242278,13709099778, 23871182760,86428949742,126606734382,168135540408]