A200081 - OEIS

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A200081 as a simple table

n	a(n)
1	1
2	8
3	22
4	64
5	182
6	454
7	1046
8	2546
9	5056
10	11638
11	33262
12	101112
13	191802
14	688304
15	769106
16	1102184
17	5220960
18	23546744
19	49886556
20	135889790
21	142614238
22	121124812
23	570957758

[1,8,22,64,182,454,1046,2546,5056,11638,33262, 101112,191802,688304,769106,1102184,5220960, 23546744,49886556,135889790,142614238,121124812, 570957758]