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A099185
as a simple table
n
a(n)
0
2
1
6
2
146
3
2074806
4
5954444157018557346
5
140744820294208035204656447906095566299588102457814757606
[2,6,146,2074806,5954444157018557346, 14074482029420803520465644790609556629958810245781\ 4757606]