n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 10 |
4 | 30 |
5 | 75 |
6 | 206 |
7 | 518 |
8 | 1344 |
9 | 3357 |
10 | 8429 |
11 | 20759 |
12 | 51044 |
13 | 123973 |
14 | 299848 |
15 | 719197 |
16 | 1716563 |
17 | 4070800 |
18 | 9607797 |
19 | 22555988 |
20 | 52718749 |
21 | 122655485 |
22 | 284207304 |
23 | 655894527 |
24 | 1508046031 |
25 | 3454808143 |
26 | 7887768997 |
27 | 17949709753 |
28 | 40719611684 |
29 | 92096461012 |
30 | 207697731344 |
[1,1,4,10,30,75,206,518,1344,3357,8429,20759, 51044,123973,299848,719197,1716563,4070800, 9607797,22555988,52718749,122655485,284207304, 655894527,1508046031,3454808143,7887768997, 17949709753,40719611684,92096461012,207697731344] |