A130525 - OEIS

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A130525 as a simple table

n	a(n)
0	1
1	3
2	13
3	63
4	324
5	1733
6	9541
7	53725
8	308085
9	1793528
10	10574165
11	63018105
12	379061652
13	2298508872
14	14035737150
15	86239762294
16	532743452260
17	3305228985864
18	20546951820588
19	127237301998014
20	774257153670067

[1,3,13,63,324,1733,9541,53725,308085,1793528, 10574165,63018105,379061652,2298508872, 14035737150,86239762294,532743452260, 3305228985864,20546951820588,127237301998014, 774257153670067]