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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 2 |
| 5 | 3 |
| 6 | 13 |
| 7 | 11 |
| 8 | 50 |
| 9 | 71 |
| 10 | 271 |
| 11 | 281 |
| 12 | 2139 |
| 13 | 1741 |
| 14 | 9639 |
| 15 | 20452 |
| 16 | 58019 |
| 17 | 79293 |
| 18 | 599367 |
| 19 | 566739 |
| 20 | 3667942 |
| 21 | 6931300 |
| 22 | 23775873 |
| 23 | 31008623 |
| 24 | 246106846 |
| 25 | 282422549 |
| 26 | 1357817329 |
| 27 | 2615067894 |
| 28 | 11358094490 |
[0,0,1,2,3,13,11,50,71,271,281,2139,1741,9639, 20452,58019,79293,599367,566739,3667942,6931300, 23775873,31008623,246106846,282422549,1357817329, 2615067894,11358094490] |