A020528 - OEIS

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A020528 as a simple table

n	a(n)
0	0
1	18
2	252
3	2520
4	22320
5	187488
6	1536192
7	12435840
8	100074240
9	802948608
10	6433016832
11	51501864960
12	412165877760
13	3297930928128
14	26385863196672
15	211096568954880
16	1688811205754880
17	13510644263682048

[0,18,252,2520,22320,187488,1536192,12435840, 100074240,802948608,6433016832,51501864960, 412165877760,3297930928128,26385863196672, 211096568954880,1688811205754880, 13510644263682048]

[0,18,252,2520,22320,187488,1536192,12435840,
 100074240,802948608,6433016832,51501864960,
 412165877760,3297930928128,26385863196672,
 211096568954880,1688811205754880,
 13510644263682048]