The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 1 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 1 |
| 11 | 3 |
| 12 | 0 |
| 13 | 6 |
| 14 | 0 |
| 15 | 27 |
| 16 | 13 |
| 17 | 59 |
| 18 | 390 |
| 19 | 661 |
| 20 | 4933 |
| 21 | 9760 |
| 22 | 49415 |
| 23 | 101967 |
| 24 | 341887 |
| 25 | 702884 |
| 26 | 2209559 |
| 27 | 5361004 |
| 28 | 15472531 |
| 29 | 34165997 |
| 30 | 82258594 |
| 31 | 193682533 |
| 32 | 490404772 |
| 33 | 1210929426 |
| 34 | 2725005202 |
| 35 | 6283337761 |
| 36 | 13672859806 |
| 37 | 34906926846 |
[1,1,0,0,0,1,1,0,0,0,1,3,0,6,0,27,13,59,390,661, 4933,9760,49415,101967,341887,702884,2209559, 5361004,15472531,34165997,82258594,193682533, 490404772,1210929426,2725005202,6283337761, 13672859806,34906926846] |