n | a(n) |
---|---|
1 | 2 |
2 | 7 |
3 | 23 |
4 | 75 |
5 | 242 |
6 | 772 |
7 | 2430 |
8 | 7529 |
9 | 22941 |
10 | 68801 |
11 | 203488 |
12 | 594994 |
13 | 1724242 |
14 | 4963041 |
15 | 14213111 |
16 | 40540661 |
17 | 115235882 |
18 | 326470662 |
19 | 921780312 |
20 | 2593408123 |
21 | 7269728291 |
22 | 20302519239 |
23 | 56493171410 |
24 | 156652350614 |
25 | 433009258768 |
[2,7,23,75,242,772,2430,7529,22941,68801,203488, 594994,1724242,4963041,14213111,40540661, 115235882,326470662,921780312,2593408123, 7269728291,20302519239,56493171410,156652350614, 433009258768] |