n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 1 |
4 | 5 |
5 | 15 |
6 | 47 |
7 | 127 |
8 | 363 |
9 | 978 |
10 | 2778 |
11 | 7624 |
12 | 21566 |
13 | 60584 |
14 | 172221 |
15 | 488978 |
16 | 1398457 |
17 | 4001323 |
18 | 11490717 |
19 | 33037548 |
20 | 95195793 |
21 | 274609124 |
22 | 793298293 |
23 | 2294114542 |
24 | 6641070332 |
25 | 19241453969 |
26 | 55795142707 |
27 | 161910611244 |
[0,0,1,5,15,47,127,363,978,2778,7624,21566,60584, 172221,488978,1398457,4001323,11490717,33037548, 95195793,274609124,793298293,2294114542, 6641070332,19241453969,55795142707,161910611244] |