A219593 - OEIS

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A219593 as a simple table

n	a(n)
1	21
2	81
3	1188
4	14793
5	156964
6	1767430
7	21435360
8	259297241
9	2992271478
10	32522357305
11	335372829196
12	3312669542090
13	31487964667940
14	288434629481468
15	2549339374347045
16	21786411636714179
17	180452978644995861

[21,81,1188,14793,156964,1767430,21435360, 259297241,2992271478,32522357305,335372829196, 3312669542090,31487964667940,288434629481468, 2549339374347045,21786411636714179, 180452978644995861]