A360412 - OEIS

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A360412 as a simple table

n	a(n)
0	0
1	0
2	2
3	10
4	46
5	192
6	780
7	3090
8	12136
9	47100
10	181820
11	697856
12	2667642
13	10157814
14	38563342
15	146002012
16	551483230
17	2078722874
18	7821121318
19	29378487188

[0,0,2,10,46,192,780,3090,12136,47100,181820, 697856,2667642,10157814,38563342,146002012, 551483230,2078722874,7821121318,29378487188]