n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 4 |
5 | 13 |
6 | 38 |
7 | 106 |
8 | 288 |
9 | 771 |
10 | 2046 |
11 | 5401 |
12 | 14212 |
13 | 37324 |
14 | 97904 |
15 | 256621 |
16 | 672336 |
17 | 1760997 |
18 | 4611642 |
19 | 12075526 |
20 | 31617520 |
21 | 82781215 |
22 | 216732890 |
23 | 567428401 |
24 | 1485570024 |
25 | 3889310328 |
26 | 10182407328 |
27 | 26657986681 |
28 | 69791674108 |
[0,0,0,1,4,13,38,106,288,771,2046,5401,14212, 37324,97904,256621,672336,1760997,4611642, 12075526,31617520,82781215,216732890,567428401, 1485570024,3889310328,10182407328,26657986681, 69791674108] |