n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 4 |
3 | 14 |
4 | 48 |
5 | 165 |
6 | 572 |
7 | 2002 |
8 | 7072 |
9 | 25194 |
10 | 90440 |
11 | 326876 |
12 | 1188640 |
13 | 4345965 |
14 | 15967980 |
15 | 58929450 |
16 | 218349120 |
17 | 811985790 |
18 | 3029594040 |
19 | 11338026180 |
20 | 42550029600 |
21 | 160094486370 |
22 | 603784920024 |
23 | 2282138106804 |
24 | 8643460269248 |
[0,1,4,14,48,165,572,2002,7072,25194,90440,326876, 1188640,4345965,15967980,58929450,218349120, 811985790,3029594040,11338026180,42550029600, 160094486370,603784920024,2282138106804, 8643460269248] |