n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 3 |
4 | 7 |
5 | 16 |
6 | 39 |
7 | 102 |
8 | 279 |
9 | 782 |
10 | 2227 |
11 | 6427 |
12 | 18769 |
13 | 55376 |
14 | 164801 |
15 | 494071 |
16 | 1490663 |
17 | 4522690 |
18 | 13790171 |
19 | 42234621 |
20 | 129866725 |
21 | 400765128 |
22 | 1240796725 |
23 | 3853055776 |
24 | 11997619209 |
25 | 37451945874 |
26 | 117181432493 |
27 | 367428949069 |
[1,0,1,3,7,16,39,102,279,782,2227,6427,18769, 55376,164801,494071,1490663,4522690,13790171, 42234621,129866725,400765128,1240796725, 3853055776,11997619209,37451945874,117181432493, 367428949069] |