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A218397
as a simple table
n
a(n)
1
70007020020
2
27272070272700
3
20720272227227700077007700020
4
22200020770272007007202277772702722200
[70007020020,27272070272700, 20720272227227700077007700020, 22200020770272007007202277772702722200]