n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 11 |
6 | 30 |
7 | 88 |
8 | 266 |
9 | 825 |
10 | 2613 |
11 | 8408 |
12 | 27421 |
13 | 90422 |
14 | 300987 |
15 | 1010008 |
16 | 3413027 |
17 | 11604237 |
18 | 39668334 |
19 | 136258178 |
20 | 470060495 |
21 | 1627913941 |
22 | 5657649569 |
23 | 19725571728 |
24 | 68975054956 |
25 | 241834515725 |
26 | 849993720642 |
27 | 2994348927858 |
28 | 10570741932441 |
29 | 37390372928207 |
30 | 132497284947463 |
[0,0,1,2,4,11,30,88,266,825,2613,8408,27421,90422, 300987,1010008,3413027,11604237,39668334, 136258178,470060495,1627913941,5657649569, 19725571728,68975054956,241834515725,849993720642, 2994348927858,10570741932441,37390372928207, 132497284947463] |