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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 6 |
| 6 | 9 |
| 7 | 24 |
| 8 | 45 |
| 9 | 108 |
| 10 | 189 |
| 11 | 504 |
| 12 | 945 |
| 13 | 2268 |
| 14 | 3969 |
| 15 | 12096 |
| 16 | 25515 |
| 17 | 68040 |
| 18 | 130977 |
| 19 | 381024 |
| 20 | 773955 |
| 21 | 2000376 |
| 22 | 3750705 |
| 23 | 11430720 |
| 24 | 24111675 |
| 25 | 64297800 |
| 26 | 123773265 |
| 27 | 360067680 |
| 28 | 731387475 |
| 29 | 1890355320 |
| 30 | 3544416225 |
| 31 | 11522165760 |
| 32 | 25823603925 |
[1,1,1,2,3,6,9,24,45,108,189,504,945,2268,3969, 12096,25515,68040,130977,381024,773955,2000376, 3750705,11430720,24111675,64297800,123773265, 360067680,731387475,1890355320,3544416225, 11522165760,25823603925] |