A060995 - OEIS

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A060995 as a simple table

n	a(n)
1	0
2	2
3	8
4	28
5	96
6	328
7	1120
8	3824
9	13056
10	44576
11	152192
12	519616
13	1774080
14	6057088
15	20680192
16	70606592
17	241065984
18	823050752
19	2810071040
20	9594182656
21	32756588544
22	111837988864
23	381838778368
24	1303679135744

[0,2,8,28,96,328,1120,3824,13056,44576,152192, 519616,1774080,6057088,20680192,70606592, 241065984,823050752,2810071040,9594182656, 32756588544,111837988864,381838778368, 1303679135744]