n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 4 |
3 | 14 |
4 | 45 |
5 | 140 |
6 | 428 |
7 | 1297 |
8 | 3912 |
9 | 11770 |
10 | 35365 |
11 | 106184 |
12 | 318696 |
13 | 956321 |
14 | 2869340 |
15 | 8608630 |
16 | 25826877 |
17 | 77482228 |
18 | 232449268 |
19 | 697351985 |
20 | 2092062720 |
21 | 6276199106 |
22 | 18828615029 |
23 | 56485873744 |
24 | 169457667600 |
25 | 508373077825 |
26 | 1525119354868 |
[0,1,4,14,45,140,428,1297,3912,11770,35365,106184, 318696,956321,2869340,8608630,25826877,77482228, 232449268,697351985,2092062720,6276199106, 18828615029,56485873744,169457667600,508373077825, 1525119354868] |