n | a(n) |
---|---|
1 | 1 |
2 | -1 |
3 | 1 |
4 | 3 |
5 | 4 |
6 | 3 |
7 | 4 |
8 | 19 |
9 | 60 |
10 | 124 |
11 | 214 |
12 | 455 |
13 | 1266 |
14 | 3404 |
15 | 7974 |
16 | 17699 |
17 | 42050 |
18 | 107956 |
19 | 276534 |
20 | 680140 |
21 | 1647872 |
22 | 4082562 |
23 | 10366604 |
24 | 26363583 |
25 | 66318590 |
26 | 166265630 |
27 | 420151570 |
28 | 1070885100 |
29 | 2734066540 |
30 | 6964626146 |
31 | 17739885228 |
32 | 45334834067 |
33 | 116258144838 |
[1,-1,1,3,4,3,4,19,60,124,214,455,1266,3404,7974, 17699,42050,107956,276534,680140,1647872,4082562, 10366604,26363583,66318590,166265630,420151570, 1070885100,2734066540,6964626146,17739885228, 45334834067,116258144838] |