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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 36 |
| 5 | 285 |
| 6 | 2662 |
| 7 | 30147 |
| 8 | 395976 |
| 9 | 5968505 |
| 10 | 101054282 |
| 11 | 1901962687 |
| 12 | 39368308716 |
| 13 | 889051951125 |
| 14 | 21749632880302 |
| 15 | 573017429752827 |
| 16 | 16174993678778256 |
| 17 | 487024011982108145 |
| 18 | 15580632579831576722 |
[0,1,2,7,36,285,2662,30147,395976,5968505, 101054282,1901962687,39368308716,889051951125, 21749632880302,573017429752827,16174993678778256, 487024011982108145,15580632579831576722] |