A277768 - OEIS

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A277768 as a simple table

n	a(n)
1	0
2	2
3	17
4	204
5	1989
6	21141
7	220549
8	2292380
9	23911889
10	249253583
11	2597767946
12	27078215723
13	282249897665
14	2942003150449
15	30665850885332
16	319644266438138
17	3331797339053418
18	34728844714392948
19	361994612635214032

[0,2,17,204,1989,21141,220549,2292380,23911889, 249253583,2597767946,27078215723,282249897665, 2942003150449,30665850885332,319644266438138, 3331797339053418,34728844714392948, 361994612635214032]