n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 1 |
4 | 2 |
5 | 5 |
6 | 9 |
7 | 20 |
8 | 44 |
9 | 101 |
10 | 239 |
11 | 584 |
12 | 1468 |
13 | 3789 |
14 | 10027 |
15 | 27161 |
16 | 75211 |
17 | 212651 |
18 | 613228 |
19 | 1801879 |
20 | 5390071 |
21 | 16401436 |
22 | 50730640 |
23 | 159393146 |
24 | 508408373 |
25 | 1645330314 |
26 | 5399614435 |
27 | 17960973056 |
28 | 60528130675 |
[1,0,1,1,2,5,9,20,44,101,239,584,1468,3789,10027, 27161,75211,212651,613228,1801879,5390071, 16401436,50730640,159393146,508408373,1645330314, 5399614435,17960973056,60528130675] |