A305222 - OEIS

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A305222 as a simple table

n	a(n)
1	0
2	72
3	264
4	2184
5	18876
6	212231
7	1893682
8	18341237
9	187726549
10	1840314098
11	18245534902
12	183015534083
13	1824304190546
14	18181062439771
15	181718318664105
16	1815055170789611
17	18120171543186402
18	181005843101434032

[0,72,264,2184,18876,212231,1893682,18341237, 187726549,1840314098,18245534902,183015534083, 1824304190546,18181062439771,181718318664105, 1815055170789611,18120171543186402, 181005843101434032]