n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 15 |
3 | 105 |
4 | 465 |
5 | 1540 |
6 | 4186 |
7 | 9870 |
8 | 20910 |
9 | 40755 |
10 | 74305 |
11 | 128271 |
12 | 211575 |
13 | 335790 |
14 | 515620 |
15 | 769420 |
16 | 1119756 |
17 | 1594005 |
18 | 2224995 |
19 | 3051685 |
20 | 4119885 |
21 | 5483016 |
22 | 7202910 |
23 | 9350650 |
24 | 12007450 |
25 | 15265575 |
26 | 19229301 |
27 | 24015915 |
28 | 29756755 |
29 | 36598290 |
[0,1,15,105,465,1540,4186,9870,20910,40755,74305, 128271,211575,335790,515620,769420,1119756, 1594005,2224995,3051685,4119885,5483016,7202910, 9350650,12007450,15265575,19229301,24015915, 29756755,36598290] |