n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 7 |
4 | 28 |
5 | 122 |
6 | 558 |
7 | 2641 |
8 | 12822 |
9 | 63501 |
10 | 319554 |
11 | 1629321 |
12 | 8399092 |
13 | 43701735 |
14 | 229211236 |
15 | 1210561517 |
16 | 6432491192 |
17 | 34364148528 |
18 | 184463064936 |
19 | 994430028087 |
20 | 5381653402890 |
21 | 29226425965907 |
22 | 159227245772460 |
23 | 870004781620093 |
24 | 4766330416567254 |
25 | 26176585256712224 |
[1,2,7,28,122,558,2641,12822,63501,319554,1629321, 8399092,43701735,229211236,1210561517,6432491192, 34364148528,184463064936,994430028087, 5381653402890,29226425965907,159227245772460, 870004781620093,4766330416567254, 26176585256712224] |