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A027580
as a simple table
n
a(n)
1
55
2
51015
3
554455
4
51488415
5
510151015
6
55883648705050784638855
7
531578379527444725973875135
[55,51015,554455,51488415,510151015, 55883648705050784638855, 531578379527444725973875135]