A051819 - OEIS

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A051819 as a simple table

n	a(n)
1	1
2	23
3	228
4	2536
5	29135
6	320182
7	3348887
8	33918043
9	337681353
10	3346457531
11	33328331754
12	335156871449
13	3402031164396
14	34729171765901
15	354926411492071
16	3618033042193311

[1,23,228,2536,29135,320182,3348887,33918043, 337681353,3346457531,33328331754,335156871449, 3402031164396,34729171765901,354926411492071, 3618033042193311]