n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 4 |
4 | 19 |
5 | 54 |
6 | 155 |
7 | 432 |
8 | 1252 |
9 | 3384 |
10 | 9714 |
11 | 26752 |
12 | 75836 |
13 | 213058 |
14 | 603791 |
15 | 1702868 |
16 | 4830747 |
17 | 13666890 |
18 | 38742120 |
19 | 109715858 |
20 | 310884129 |
21 | 880368618 |
22 | 2493252951 |
23 | 7058102770 |
24 | 19978082407 |
25 | 56531061316 |
26 | 159932660960 |
27 | 452354328946 |
28 | 1279190479845 |
29 | 3616595649500 |
[0,1,4,19,54,155,432,1252,3384,9714,26752,75836, 213058,603791,1702868,4830747,13666890,38742120, 109715858,310884129,880368618,2493252951, 7058102770,19978082407,56531061316,159932660960, 452354328946,1279190479845,3616595649500] |