n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 6 |
5 | 24 |
6 | 81 |
7 | 250 |
8 | 732 |
9 | 2073 |
10 | 5742 |
11 | 15664 |
12 | 42273 |
13 | 113202 |
14 | 301428 |
15 | 799273 |
16 | 2112774 |
17 | 5571816 |
18 | 14668209 |
19 | 38563882 |
20 | 101285580 |
21 | 265817145 |
22 | 697214430 |
23 | 1827923296 |
24 | 4790749761 |
25 | 12552714594 |
26 | 32884171236 |
27 | 86133353545 |
28 | 225582998262 |
29 | 590749858968 |
30 | 1546935014097 |
[0,0,0,1,6,24,81,250,732,2073,5742,15664,42273, 113202,301428,799273,2112774,5571816,14668209, 38563882,101285580,265817145,697214430,1827923296, 4790749761,12552714594,32884171236,86133353545, 225582998262,590749858968,1546935014097] |