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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 11 |
| 3 | 104 |
| 4 | 1405 |
| 5 | 24694 |
| 6 | 534223 |
| 7 | 13719404 |
| 8 | 407730041 |
| 9 | 13760958410 |
| 10 | 519827337331 |
| 11 | 21726980525392 |
| 12 | 995403499490101 |
| 13 | 49600090942276094 |
| 14 | 2670566242480261175 |
| 15 | 154500457959360271124 |
| 16 | 9557826199486960327153 |
| 17 | 629586464929967678553874 |
| 18 | 43994787057844036765113691 |
[1,2,11,104,1405,24694,534223,13719404,407730041, 13760958410,519827337331,21726980525392, 995403499490101,49600090942276094, 2670566242480261175,154500457959360271124, 9557826199486960327153,629586464929967678553874, 43994787057844036765113691] |