n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 10 |
3 | 19 |
4 | 109 |
5 | 280 |
6 | 1261 |
7 | 3781 |
8 | 15130 |
9 | 49159 |
10 | 185329 |
11 | 627760 |
12 | 2295721 |
13 | 7945561 |
14 | 28607050 |
15 | 100117099 |
16 | 357580549 |
17 | 1258634440 |
18 | 4476859381 |
19 | 15804569341 |
20 | 56096303770 |
21 | 198337427839 |
22 | 703204161769 |
23 | 2488241012320 |
[1,1,10,19,109,280,1261,3781,15130,49159,185329, 627760,2295721,7945561,28607050,100117099, 357580549,1258634440,4476859381,15804569341, 56096303770,198337427839,703204161769, 2488241012320] |