n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 5 |
5 | 16 |
6 | 56 |
7 | 198 |
8 | 699 |
9 | 2490 |
10 | 8943 |
11 | 32355 |
12 | 117800 |
13 | 431316 |
14 | 1587207 |
15 | 5867244 |
16 | 21777203 |
17 | 81127591 |
18 | 303240041 |
19 | 1136914129 |
20 | 4274441613 |
21 | 16111746161 |
22 | 60873695892 |
23 | 230495640009 |
24 | 874525192278 |
25 | 3324270554675 |
26 | 12658405644200 |
27 | 48280298159610 |
[0,0,0,1,5,16,56,198,699,2490,8943,32355,117800, 431316,1587207,5867244,21777203,81127591, 303240041,1136914129,4274441613,16111746161, 60873695892,230495640009,874525192278, 3324270554675,12658405644200,48280298159610] |