n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 3 |
4 | 9 |
5 | 23 |
6 | 60 |
7 | 152 |
8 | 388 |
9 | 984 |
10 | 2501 |
11 | 6347 |
12 | 16117 |
13 | 40911 |
14 | 103864 |
15 | 263664 |
16 | 669352 |
17 | 1699216 |
18 | 4313673 |
19 | 10950739 |
20 | 27799745 |
21 | 70572839 |
22 | 179157364 |
23 | 454811656 |
24 | 1154592108 |
25 | 2931065640 |
26 | 7440849549 |
27 | 18889457819 |
28 | 47953075565 |
[0,1,3,9,23,60,152,388,984,2501,6347,16117,40911, 103864,263664,669352,1699216,4313673,10950739, 27799745,70572839,179157364,454811656,1154592108, 2931065640,7440849549,18889457819,47953075565] |