A060337 - OEIS

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A060337 as a simple table

n	a(n)
3	15
4	198
5	1610
6	10575
7	61845
8	336924
9	1751076
10	8801325
11	43141175
12	207347778
13	980828238
14	4578689115
15	21135851625
16	96628899960
17	438068838536
18	1971349880985
19	8813183238315
20	39169902510270
21	173172640973010

[15,198,1610,10575,61845,336924,1751076,8801325, 43141175,207347778,980828238,4578689115, 21135851625,96628899960,438068838536, 1971349880985,8813183238315,39169902510270, 173172640973010]