The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 3 | 0 |
| 4 | 1 |
| 5 | 3 |
| 6 | 1 |
| 7 | 12 |
| 8 | 19 |
| 9 | 41 |
| 10 | 100 |
| 11 | 224 |
| 12 | 556 |
| 13 | 1358 |
| 14 | 3161 |
| 15 | 7942 |
| 16 | 20425 |
| 17 | 51169 |
| 18 | 132552 |
| 19 | 344237 |
| 20 | 881172 |
| 21 | 2293345 |
| 22 | 5967738 |
| 23 | 15536027 |
| 24 | 40732665 |
| 25 | 107031703 |
| 26 | 282012276 |
| 27 | 745863438 |
| 28 | 1976632940 |
| 29 | 5250724669 |
| 30 | 13980465361 |
| 31 | 37288522414 |
[0,1,3,1,12,19,41,100,224,556,1358,3161,7942, 20425,51169,132552,344237,881172,2293345,5967738, 15536027,40732665,107031703,282012276,745863438, 1976632940,5250724669,13980465361,37288522414] |