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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 18 |
| 4 | 97 |
| 5 | 802 |
| 6 | 10565 |
| 7 | 228850 |
| 8 | 8289217 |
| 9 | 506526530 |
| 10 | 52501381765 |
| 11 | 9260170733266 |
| 12 | 2784551512218145 |
| 13 | 1429063630276963426 |
| 14 | 1252517782851235507141 |
| 15 | 1875484239084442842046130 |
| 16 | 4798818821638537354534159233 |
| 17 | 20984654018757393270224583817858 |
[1,2,5,18,97,802,10565,228850,8289217,506526530, 52501381765,9260170733266,2784551512218145, 1429063630276963426,1252517782851235507141, 1875484239084442842046130, 4798818821638537354534159233, 20984654018757393270224583817858] |