The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 0 |
| 3 | -1 |
| 4 | 0 |
| 5 | 2 |
| 6 | 0 |
| 7 | -5 |
| 8 | 0 |
| 9 | 14 |
| 10 | 0 |
| 11 | -42 |
| 12 | 0 |
| 13 | 132 |
| 14 | 0 |
| 15 | -429 |
| 16 | 0 |
| 17 | 1430 |
| 18 | 0 |
| 19 | -4862 |
| 20 | 0 |
| 21 | 16796 |
| 22 | 0 |
| 23 | -58786 |
| 24 | 0 |
| 25 | 208012 |
| 26 | 0 |
| 27 | -742900 |
| 28 | 0 |
| 29 | 2674440 |
| 30 | 0 |
| 31 | -9694845 |
| 32 | 0 |
| 33 | 35357670 |
| 34 | 0 |
| 35 | -129644790 |
| 36 | 0 |
| 37 | 477638700 |
| 38 | 0 |
| 39 | -1767263190 |
| 40 | 0 |
| 41 | 6564120420 |
| 42 | 0 |
| 43 | -24466267020 |
| 44 | 0 |
| 45 | 91482563640 |
| 46 | 0 |
| 47 | -343059613650 |
| 48 | 0 |
[1,1,0,-1,0,2,0,-5,0,14,0,-42,0,132,0,-429,0,1430, 0,-4862,0,16796,0,-58786,0,208012,0,-742900,0, 2674440,0,-9694845,0,35357670,0,-129644790,0, 477638700,0,-1767263190,0,6564120420,0, -24466267020,0,91482563640,0,-343059613650,0] |