n | a(n) |
---|---|
0 | 1 |
1 | -1 |
2 | 3 |
3 | 1 |
4 | 41 |
5 | 171 |
6 | 799 |
7 | 2633 |
8 | 7881 |
9 | 24391 |
10 | 99611 |
11 | 461649 |
12 | 2252953 |
13 | 10773491 |
14 | 46602711 |
15 | 176413201 |
16 | 596116769 |
17 | 1899975183 |
18 | 6302881171 |
19 | 24136694081 |
20 | 105765310281 |
21 | 476455493179 |
22 | 2033813426063 |
23 | 8019234229401 |
24 | 29410337173561 |
25 | 102444237073751 |
26 | 347418130583499 |
[1,-1,3,1,41,171,799,2633,7881,24391,99611,461649, 2252953,10773491,46602711,176413201,596116769, 1899975183,6302881171,24136694081,105765310281, 476455493179,2033813426063,8019234229401, 29410337173561,102444237073751,347418130583499] |