A166914 - OEIS

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A166914 as a simple table

n	a(n)
0	21
1	340
2	5456
3	87360
4	1398016
5	22369280
6	357912576
7	5726617600
8	91625947136
9	1466015416320
10	23456247709696
11	375299967549440
12	6004799497568256
13	96076792028200960
14	1537228672719650816
15	24595658764588154880

[21,340,5456,87360,1398016,22369280,357912576, 5726617600,91625947136,1466015416320, 23456247709696,375299967549440,6004799497568256, 96076792028200960,1537228672719650816, 24595658764588154880]