A014318 - OEIS

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A014318 as a simple table

n	a(n)
0	1
1	3
2	8
3	21
4	56
5	154
6	440
7	1309
8	4048
9	12958
10	42712
11	144210
12	496432
13	1735764
14	6145968
15	21986781
16	79331232
17	288307254
18	1054253208
19	3875769606
20	14315659632
21	53097586284
22	197677736208
23	738415086066

[1,3,8,21,56,154,440,1309,4048,12958,42712,144210, 496432,1735764,6145968,21986781,79331232, 288307254,1054253208,3875769606,14315659632, 53097586284,197677736208,738415086066]