n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 2 |
4 | 34 |
5 | 250 |
6 | 1234 |
7 | 4830 |
8 | 16174 |
9 | 48444 |
10 | 133416 |
11 | 344220 |
12 | 843020 |
13 | 1978804 |
14 | 4484228 |
15 | 9865742 |
16 | 21166390 |
17 | 44439910 |
18 | 91570126 |
19 | 185614242 |
20 | 370846914 |
21 | 731502296 |
22 | 1426514540 |
23 | 2753525208 |
24 | 5266164280 |
25 | 9987859912 |
26 | 18799814312 |
27 | 35141997050 |
28 | 65274659562 |
29 | 120540177522 |
[0,0,0,2,34,250,1234,4830,16174,48444,133416, 344220,843020,1978804,4484228,9865742,21166390, 44439910,91570126,185614242,370846914,731502296, 1426514540,2753525208,5266164280,9987859912, 18799814312,35141997050,65274659562,120540177522] |