n | a(n) |
---|---|
-1 | -1 |
0 | 2 |
1 | 2 |
2 | 4 |
3 | 10 |
4 | 28 |
5 | 84 |
6 | 264 |
7 | 858 |
8 | 2860 |
9 | 9724 |
10 | 33592 |
11 | 117572 |
12 | 416024 |
13 | 1485800 |
14 | 5348880 |
15 | 19389690 |
16 | 70715340 |
17 | 259289580 |
18 | 955277400 |
19 | 3534526380 |
20 | 13128240840 |
21 | 48932534040 |
22 | 182965127280 |
23 | 686119227300 |
24 | 2579808294648 |
25 | 9723892802904 |
26 | 36734706144304 |
27 | 139067101832008 |
28 | 527495903500720 |
29 | 2004484433302736 |
[-1,2,2,4,10,28,84,264,858,2860,9724,33592,117572, 416024,1485800,5348880,19389690,70715340, 259289580,955277400,3534526380,13128240840, 48932534040,182965127280,686119227300, 2579808294648,9723892802904,36734706144304, 139067101832008,527495903500720,2004484433302736] |