n | a(n) |
---|---|
3 | 1 |
4 | 4 |
5 | 14 |
6 | 45 |
7 | 140 |
8 | 427 |
9 | 1288 |
10 | 3858 |
11 | 11505 |
12 | 34210 |
13 | 101530 |
14 | 300950 |
15 | 891345 |
16 | 2638650 |
17 | 7809000 |
18 | 23107488 |
19 | 68375547 |
20 | 202336092 |
21 | 598817490 |
22 | 1772479905 |
23 | 5247421410 |
24 | 15538054455 |
25 | 46019183840 |
26 | 136325212750 |
27 | 403933918375 |
28 | 1197131976846 |
29 | 3548715207534 |
30 | 10521965227669 |
[1,4,14,45,140,427,1288,3858,11505,34210,101530, 300950,891345,2638650,7809000,23107488,68375547, 202336092,598817490,1772479905,5247421410, 15538054455,46019183840,136325212750,403933918375, 1197131976846,3548715207534,10521965227669] |