A219983 - OEIS

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A219983 as a simple table

n	a(n)
1	21
2	2199
3	131978
4	7542829
5	441412699
6	25862914118
7	1513751822570
8	88598966974708
9	5185871091616559
10	303538715007889396
11	17766656713730059860
12	1039913922040638093334
13	60868009800206579292733

[21,2199,131978,7542829,441412699,25862914118, 1513751822570,88598966974708,5185871091616559, 303538715007889396,17766656713730059860, 1039913922040638093334,60868009800206579292733]