A037654 - OEIS

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A037654 as a simple table

n	a(n)
1	3
2	15
3	77
4	388
5	1940
6	9702
7	48513
8	242565
9	1212827
10	6064138
11	30320690
12	151603452
13	758017263
14	3790086315
15	18950431577
16	94752157888
17	473760789440
18	2368803947202
19	11844019736013
20	59220098680065
21	296100493400327

[3,15,77,388,1940,9702,48513,242565,1212827, 6064138,30320690,151603452,758017263,3790086315, 18950431577,94752157888,473760789440, 2368803947202,11844019736013,59220098680065, 296100493400327]