A141267 - OEIS

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A141267 as a simple table

n	a(n)
0	1
1	21
2	321
3	8321
4	158321
5	48158321
6	10548158321
7	38410548158321
8	94538410548158321
9	384094538410548158321
10	10395384094538410548158321
11	4608010395384094538410548158321
12	1351354608010395384094538410548158321

[1,21,321,8321,158321,48158321,10548158321, 38410548158321,94538410548158321, 384094538410548158321,10395384094538410548158321, 4608010395384094538410548158321, 1351354608010395384094538410548158321]