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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 5 |
| 5 | 9 |
| 6 | 44 |
| 7 | 114 |
| 8 | 564 |
| 9 | 1882 |
| 10 | 9665 |
| 11 | 39083 |
| 12 | 211025 |
| 13 | 993803 |
| 14 | 5686104 |
| 15 | 30342060 |
| 16 | 184813048 |
| 17 | 1095555260 |
| 18 | 7118824417 |
| 19 | 46199135453 |
| 20 | 320295658577 |
| 21 | 2250749112381 |
| 22 | 16626717667348 |
| 23 | 125452246988974 |
| 24 | 985178854556524 |
[0,1,1,5,9,44,114,564,1882,9665,39083,211025, 993803,5686104,30342060,184813048,1095555260, 7118824417,46199135453,320295658577,2250749112381, 16626717667348,125452246988974,985178854556524] |