A118569 - OEIS

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A118569 as a simple table

n	a(n)
1	21
2	43
3	67
4	87
5	321
6	4321
7	4567
8	6789
9	78901
10	432109
11	9012345
12	67890123
13	109876543
14	123456789
15	6543210987
16	8901234567

[21,43,67,87,321,4321,4567,6789,78901,432109, 9012345,67890123,109876543,123456789,6543210987, 8901234567]

[21,43,67,87,321,4321,4567,6789,78901,432109,
 9012345,67890123,109876543,123456789,6543210987,
 8901234567]