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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 10 |
| 2 | 281 |
| 3 | 10580 |
| 4 | 457700 |
| 5 | 21475122 |
| 6 | 1062749598 |
| 7 | 54611328552 |
| 8 | 2886091165052 |
| 9 | 155866877884424 |
| 10 | 8564415357567017 |
| 11 | 477261537757290340 |
| 12 | 26908911750685828972 |
| 13 | 1532232857543951354044 |
| 14 | 87987735421932575184876 |
| 15 | 5089715542281323916803664 |
| 16 | 296304273741441480224927436 |
[1,10,281,10580,457700,21475122,1062749598, 54611328552,2886091165052,155866877884424, 8564415357567017,477261537757290340, 26908911750685828972,1532232857543951354044, 87987735421932575184876,5089715542281323916803664, 296304273741441480224927436] |