n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 7 |
4 | 17 |
5 | 41 |
6 | 100 |
7 | 240 |
8 | 580 |
9 | 1400 |
10 | 3380 |
11 | 8160 |
12 | 19700 |
13 | 47560 |
14 | 114820 |
15 | 277200 |
16 | 669220 |
17 | 1615640 |
18 | 3900500 |
19 | 9416640 |
20 | 22733780 |
21 | 54884200 |
22 | 132502180 |
23 | 319888560 |
24 | 772279300 |
25 | 1864447160 |
26 | 4501173620 |
27 | 10866794400 |
28 | 26234762420 |
29 | 63336319240 |
[1,1,3,7,17,41,100,240,580,1400,3380,8160,19700, 47560,114820,277200,669220,1615640,3900500, 9416640,22733780,54884200,132502180,319888560, 772279300,1864447160,4501173620,10866794400, 26234762420,63336319240] |