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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 6 |
| 3 | 105 |
| 4 | 595 |
| 5 | 10296 |
| 6 | 58311 |
| 7 | 1008910 |
| 8 | 5713890 |
| 9 | 98862891 |
| 10 | 559902916 |
| 11 | 9687554415 |
| 12 | 54864771885 |
| 13 | 949281469786 |
| 14 | 5376187741821 |
| 15 | 93019896484620 |
| 16 | 526811533926580 |
| 17 | 9115000574022981 |
| 18 | 51622154137063026 |
| 19 | 893177036357767525 |
| 20 | 5058444293898249975 |
| 21 | 87522234562487194476 |
[0,1,6,105,595,10296,58311,1008910,5713890, 98862891,559902916,9687554415,54864771885, 949281469786,5376187741821,93019896484620, 526811533926580,9115000574022981, 51622154137063026,893177036357767525, 5058444293898249975,87522234562487194476] |