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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 1 |
| 10 | 45 |
| 11 | 1155 |
| 12 | 22275 |
| 13 | 359502 |
| 14 | 5135130 |
| 15 | 67128490 |
| 16 | 820784250 |
| 17 | 9528822303 |
| 18 | 106175420065 |
| 19 | 1144618783815 |
| 20 | 12011663703975 |
| 21 | 123297356170054 |
| 22 | 1243260840764910 |
| 23 | 12377559175117290 |
| 24 | 122870882863640450 |
| 25 | 1247553197735599755 |
| 26 | 13803307806688911225 |
[1,0,0,0,0,0,0,0,0,1,45,1155,22275,359502,5135130, 67128490,820784250,9528822303,106175420065, 1144618783815,12011663703975,123297356170054, 1243260840764910,12377559175117290, 122870882863640450,1247553197735599755, 13803307806688911225] |