n | a(n) |
---|---|
0 | 1 |
1 | -1 |
2 | 0 |
3 | 0 |
4 | 4 |
5 | 34 |
6 | 274 |
7 | 2312 |
8 | 21034 |
9 | 207790 |
10 | 2228892 |
11 | 25890642 |
12 | 324477994 |
13 | 4370180744 |
14 | 63007469346 |
15 | 968847653702 |
16 | 15834053988732 |
17 | 274170226919434 |
18 | 5015004366420178 |
19 | 96645631069563928 |
20 | 1957433140982004026 |
[1,-1,0,0,4,34,274,2312,21034,207790,2228892, 25890642,324477994,4370180744,63007469346, 968847653702,15834053988732,274170226919434, 5015004366420178,96645631069563928, 1957433140982004026] |