n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 1 |
6 | 4 |
7 | 12 |
8 | 30 |
9 | 60 |
10 | 121 |
11 | 205 |
12 | 385 |
13 | 630 |
14 | 1260 |
15 | 2156 |
16 | 4711 |
17 | 8260 |
18 | 18340 |
19 | 31620 |
20 | 68772 |
21 | 115995 |
22 | 250185 |
23 | 418825 |
24 | 914485 |
25 | 1535391 |
26 | 3405402 |
27 | 5728086 |
28 | 12788516 |
29 | 21448791 |
30 | 47902764 |
31 | 80006668 |
32 | 178864378 |
33 | 298009048 |
34 | 668688388 |
[0,0,0,0,1,4,12,30,60,121,205,385,630,1260,2156, 4711,8260,18340,31620,68772,115995,250185,418825, 914485,1535391,3405402,5728086,12788516,21448791, 47902764,80006668,178864378,298009048,668688388] |