The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 2 |
| 3 | 0 |
| 4 | 2 |
| 5 | 14 |
| 6 | 0 |
| 7 | 2 |
| 8 | 98 |
| 9 | 412 |
| 10 | 0 |
| 11 | 2 |
| 12 | 1542 |
| 13 | 13160 |
| 14 | 50832 |
| 15 | 0 |
| 16 | 2 |
| 17 | 34782 |
| 18 | 1147744 |
| 19 | 6854720 |
| 20 | 25517184 |
| 21 | 0 |
| 22 | 2 |
| 23 | 1908734 |
| 24 | 260411904 |
| 25 | 2544075264 |
| 26 | 14153094144 |
| 27 | 51759986688 |
| 28 | 0 |
| 29 | 2 |
| 30 | 166738046 |
| 31 | 107691724672 |
| 32 | 2985421682688 |
| 33 | 21570911944704 |
| 34 | 116285097148416 |
| 35 | 422000664182784 |
[1,0,2,0,2,14,0,2,98,412,0,2,1542,13160,50832,0,2, 34782,1147744,6854720,25517184,0,2,1908734, 260411904,2544075264,14153094144,51759986688,0,2, 166738046,107691724672,2985421682688, 21570911944704,116285097148416,422000664182784] |