n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 6 |
3 | 17 |
4 | 56 |
5 | 179 |
6 | 576 |
7 | 1851 |
8 | 5950 |
9 | 19125 |
10 | 61474 |
11 | 197597 |
12 | 635140 |
13 | 2041543 |
14 | 6562172 |
15 | 21092919 |
16 | 67799386 |
17 | 217928905 |
18 | 700493182 |
19 | 2251609065 |
20 | 7237391472 |
21 | 23263290299 |
22 | 74775653304 |
23 | 240352858739 |
24 | 772570939222 |
25 | 2483290023101 |
[1,1,6,17,56,179,576,1851,5950,19125,61474,197597, 635140,2041543,6562172,21092919,67799386, 217928905,700493182,2251609065,7237391472, 23263290299,74775653304,240352858739,772570939222, 2483290023101] |