n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 6 |
5 | 40 |
6 | 165 |
7 | 546 |
8 | 1596 |
9 | 4320 |
10 | 11115 |
11 | 27610 |
12 | 66858 |
13 | 158808 |
14 | 371553 |
15 | 858690 |
16 | 1964280 |
17 | 4454272 |
18 | 10024407 |
19 | 22410234 |
20 | 49803750 |
21 | 110096280 |
22 | 242216205 |
23 | 530573890 |
24 | 1157621556 |
25 | 2516575200 |
26 | 5452587075 |
27 | 11777596506 |
28 | 25367140386 |
29 | 54492386200 |
30 | 116769410745 |
[0,0,0,0,6,40,165,546,1596,4320,11115,27610,66858, 158808,371553,858690,1964280,4454272,10024407, 22410234,49803750,110096280,242216205,530573890, 1157621556,2516575200,5452587075,11777596506, 25367140386,54492386200,116769410745] |