A189698 - OEIS

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A189698 as a simple table

n	a(n)
1	20
2	400
3	5172
4	65297
5	862652
6	11451149
7	151788273
8	2010430729
9	26638642226
10	353018801580
11	4678246752829
12	61995665582140
13	821565095555503
14	10887399620742611
15	144280214103179733
16	1912006322548221320

[20,400,5172,65297,862652,11451149,151788273, 2010430729,26638642226,353018801580,4678246752829, 61995665582140,821565095555503,10887399620742611, 144280214103179733,1912006322548221320]