n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 15 |
5 | 41 |
6 | 106 |
7 | 279 |
8 | 729 |
9 | 1911 |
10 | 5001 |
11 | 13095 |
12 | 34281 |
13 | 89752 |
14 | 234971 |
15 | 615165 |
16 | 1610520 |
17 | 4216400 |
18 | 11038675 |
19 | 28899630 |
20 | 75660210 |
21 | 198081006 |
22 | 518582802 |
23 | 1357667406 |
24 | 3554419410 |
25 | 9305590831 |
26 | 24362353076 |
27 | 63781468404 |
[0,1,2,6,15,41,106,279,729,1911,5001,13095,34281, 89752,234971,615165,1610520,4216400,11038675, 28899630,75660210,198081006,518582802,1357667406, 3554419410,9305590831,24362353076,63781468404] |