n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 20 |
4 | 54 |
5 | 152 |
6 | 348 |
7 | 884 |
8 | 1974 |
9 | 4556 |
10 | 10056 |
11 | 22508 |
12 | 48636 |
13 | 106472 |
14 | 228444 |
15 | 491120 |
16 | 1046454 |
17 | 2228192 |
18 | 4713252 |
19 | 9961436 |
20 | 20960904 |
21 | 44038280 |
22 | 92252100 |
23 | 192937940 |
24 | 402599676 |
25 | 838860152 |
26 | 1744723896 |
27 | 3623869388 |
28 | 7515962172 |
[1,2,6,20,54,152,348,884,1974,4556,10056,22508, 48636,106472,228444,491120,1046454,2228192, 4713252,9961436,20960904,44038280,92252100, 192937940,402599676,838860152,1744723896, 3623869388,7515962172] |