n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 24 |
5 | 78 |
6 | 230 |
7 | 675 |
8 | 2069 |
9 | 6404 |
10 | 19708 |
11 | 60216 |
12 | 183988 |
13 | 563172 |
14 | 1725349 |
15 | 5284109 |
16 | 16177694 |
17 | 49526506 |
18 | 151635752 |
19 | 464286962 |
20 | 1421566698 |
21 | 4352505527 |
22 | 13326304313 |
23 | 40802053896 |
24 | 124926806216 |
25 | 382497958000 |
26 | 1171122069784 |
27 | 3585709284968 |
28 | 10978628154457 |
[1,1,2,6,24,78,230,675,2069,6404,19708,60216, 183988,563172,1725349,5284109,16177694,49526506, 151635752,464286962,1421566698,4352505527, 13326304313,40802053896,124926806216,382497958000, 1171122069784,3585709284968,10978628154457] |