A327443 - OEIS

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A327443 as a simple table

n	a(n)
1	0
2	2
3	4
4	13
5	145
6	416
7	621
8	1856
9	4730
10	5163
11	8113
12	18260
13	142396
14	1650399
15	6569927
16	19975865
17	23773865
18	371728346
19	517406582
20	642281555
21	864490611
22	1352215149
23	1503350552

[0,2,4,13,145,416,621,1856,4730,5163,8113,18260, 142396,1650399,6569927,19975865,23773865, 371728346,517406582,642281555,864490611, 1352215149,1503350552]